--- product_id: 25898180 title: "Watts Premier RO Water Filter 50 GPD (Gallons Per Day) Semi-Permeable Membrane Replacement for Premier Standard Reverse Osmosis System, Yellow, Built-In Check Valve, 1.8\" Dia x 10.75\" L, 1-Pack" brand: "watts premier" price: "Β₯13889" currency: JPY in_stock: true reviews_count: 13 category: "Watts Premier" url: https://www.desertcart.jp/products/25898180-watts-premier-ro-water-filter-50-gpd-gallons-per-day store_origin: JP region: Japan --- # 50 GPD filtration capacity Built-in check valve for efficiency Filters down to 1/10,000 micron Watts Premier RO Water Filter 50 GPD (Gallons Per Day) Semi-Permeable Membrane Replacement for Premier Standard Reverse Osmosis System, Yellow, Built-In Check Valve, 1.8" Dia x 10.75" L, 1-Pack **Brand:** watts premier **Price:** Β₯13889 **Availability:** βœ… In Stock ## Summary > πŸ’§ Upgrade your water, upgrade your life β€” don’t miss out on purity perfection! ## Quick Answers - **What is this?** Watts Premier RO Water Filter 50 GPD (Gallons Per Day) Semi-Permeable Membrane Replacement for Premier Standard Reverse Osmosis System, Yellow, Built-In Check Valve, 1.8" Dia x 10.75" L, 1-Pack by watts premier - **How much does it cost?** Β₯13889 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/25898180-watts-premier-ro-water-filter-50-gpd-gallons-per-day) ## Best For - watts premier enthusiasts ## Why This Product - Trusted watts premier brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Micron-Level Mastery:** Filters contaminants as tiny as 1/10,000 of a micron for ultra-pure water. - β€’ **Long Haul Reliability:** Engineered to last 2-5 years, adapting to your water quality and lifestyle. - β€’ **Plug & Play Simplicity:** Easy installation with a built-in check valve means no fuss, just fresh water. - β€’ **Trusted Industry Leader:** From Watts Premier, a brand with over 30 years of filtration innovation. - β€’ **Pure Performance, Every Drop:** 50 gallons per day capacity ensures your hydration game stays strong. ## Overview The Watts Premier 50 GPD Membrane Replacement is a high-efficiency reverse osmosis filter designed for select Watts Premier RO systems. It reduces total dissolved solids, sodium, and a broad spectrum of contaminants down to 1/10,000 of a micron. Featuring a built-in check valve for optimized performance, it offers easy installation and long-lasting filtration lasting 2 to 5 years depending on usage and water conditions. Trusted since 1989, Watts Premier delivers industry-leading water purification for health-conscious professionals. ## Description Product Description Enhance the performance of your RO system and experience perfectly purified water with the Watts Premier 50 GPD Membrane Replacement, designed to work seamlessly with Watts Premier reverse osmosis filtration systems, specifically with 4SV/4-Stage (WP500025), 5SV/5-Stage (WP500032), and Zero Waste (WP0950045). Please note that it is not compatible with Quick Change reverse osmosis systems.This advanced semi-permeable membrane filter is highly effective in reducing TDS (Total Dissolved Solids) and sodium, as well as a wide range of contaminants, such as arsenic, lead, percolate, chromium, copper, and radium. Moreover, with the ability to filter impurities down to an extraordinary 1/10,000 of a micron, this membrane significantly enhances the purity of your drinking water, ensuring that it is free from even the smallest microscopic contaminants.Measuring 1.8" in diameter and 10.75" in length, the Watts Premier Membrane Replacement is designed for easy and straightforward installation and replacement in under-sink water filtration systems. It also features a check valve built directly into the membrane for efficient performance and reliable functionality.Crafted with high-quality materials, this membrane filter is engineered to provide superior performance. With a filter rating of 2 to 5 years, it offers dependable, long-lasting protection against contaminant; however, the actual lifespan may vary based on local water conditions, use patterns, and frequency of filter changes. From the Manufacturer Watts Premier Reverse Osmosis Membranes utilize an internal check valve, so make sure to use only Watts Premier replacement RO Membranes (yellow outer wrapping tape color) for your RO Systems. Watts Premier engineers are constantly working to provide a superior long lasting quality product to you our customers. Since Premier has RO Systems out in the marketplace since 1988, we noticed that check valves, typically placed in the elbow of the system, have a tendency to wear out over time. A RO system with a faulty check valve will become less efficient by running constantly. By placing the check valve in to the membrane, you are assured constant efficient performance due to the periodic replacement of this critical component of the RO system. Using Filmed sheeting, the Watts Premier Membranes are compatible with Premier as well as all standard reverse osmosis systems. This semi permeable membrane effectively reduces TDS and sodium as well as a wide range of contaminants such as Arsenic, Lead, Percolate, Chromium, Copper, Radium and Protozoan Cysts, such as Giardia and Cryptosporidium. The heart of your Reverse Osmosis system reduces impurities down to 1/10,000 of a micron. Fits 5SV, 4SV, Manifold and Zero Waste systems. Review: A must for WATTS to drop TDS and PPM!!! - This filter is a must for WATTS 5 stage RO (WP5-50) to drop the TDS and PPM!!! My Watts RO is about 10 years old that I originally bought from desertcart and it still works great; I have gone through two faucets, two water tanks and about 2-3 of these RO membrane filters but the system works great. This 50GPD membrane is the heart of the RO system as it plays a key role in removing TDS and sodium as well as a wide range of contaminants such as arsenic, lead, chlorine, chromium, copper etc. reducing impurities down to 1/10,000 of a micron from the water that passes through the sediment and carbon filters first. Hence this membrane filter only needs to be replaced once every 2-3 years depending on your TDS levels while the other ones need replacement every 6-12 months again depending on your local water source. My area has good water and hence our filters last more than a year sometimes. I purchased a cheap TDS meter and tested my tap water at 35 PPM, while the water from the old RO filters at 31 PPM. But after changing all the filters 4 filters it came down to 2 PPM after discarding about 2 tanks of water. Overall, a very good system and filter!!! Review: > DOES THE JOB - DESCRIPTION > Color: yellow. All yellow Premier filters are the same size and fit in the same housing. They come in 18, 24, 36, and 50 g/d capacities. You need to match the capacity to your system. My understanding is that if you install a higher capacity membrane, you may have to add a flow limiter to your system. As it turned out for me, my old membrane was a 36 g/d membrane---but the system seems to work well with the 24 g/d membrane. Note also that the black rubber gasket of my 10-year old membrane was at the other end, but does not seem to matter. > This filter is 24 gallons per day, which you should check to see if it matches your existing system. > Genuine Watts #11009---which is important because Watts membranes have a built-in check valve. If you use a non-watts membrane, you may have to add a check-value to your system. > Measurements: 11 1/2" long overall; body 1 3/4" diameter; to fit in a 2" diameter tube > Comes with instructions, which aren't great. But did not exactly apply to my 25-year old Watts Premier system, because the housing of more modern Premier RO systems has been redesigned. I needed to grab the end of the old filter with pliers to pull it out. One end has two O-rings (shown in the photo on the far lower right), the other does not have O-rings but is notched. Pay attention to which way your old membrane was installed. It is as good idea to take photos with your cell phone for each step in disassembly. SUGGESTIONS > Consider replacing all the other filters at the same time---you'll get more life out of the membrane. > I suggest that you start any maintenance by cleaning the black waste-line (so that later cleaning will not accidentally contaminate your new filters). See below. > Consider replacing your tank at the same time---the rubber diaphragm in the tank has a limited life (probably 5--10 years). > Silicon grease is perfect for lubricating the O-rings for the best seal. However, you don't want silicon grease to leach into your drinking water. So if you use silicon grease on the O-rings, be sure to wipe off all excess---just a few molecules thick will do the job. Permatex PERMATEX DIELECTRIC GREASE 22058 > Silicon grease is also helpful on all the "threads" where the filter housings screw together---it allows you to easily tighten them tighter that you could easily otherwise---and when it comes time to replace the filters, the housings should unscrew easier. PREMIER RO WASTE-LINE MAINTENANCE---a good idea to do before you install the membrane filter. > After about 6 months of use, the black waste-water tube can become clogged with a bacterial mat. If you pay attention, there is an odd choking gurgling sound when the tube is almost clogged. When it is clogged, the waste water will leak from the faucet itself out onto your counter. The solution (i.e., to prevent clogging of the line) is to regularly clean-out the black waste-water line. An 18" length of "weed-whacker" cord works well. Detach the black tube from your sink waste-line, and feed the "weed-whacker cord" into the tube and scrub it out. If you've had a root-canal procedure, you know how it's done. Note that the bacterial mat is a nasty sludge---have an old cloth towel handy to catch the gunk. > About 1 1/2 years ago I purchased a "beer line brush" Draft Beer Line Hose Cleaning Brush: 3/16" diameter, which worked well the one time I used it (the 1/4" diameter model might work better). However, it also occurred to me that I could squirt a few drops of Clorox into the air gap to prevent the bacterial mat from forming. Since I've been doing that once every few months, the waste line has not clogged up, so, I haven't needed to use the brush. The following bottle, which works well for this purpose is $3 at the Container Store Nalgene Plastic Drop Bottle. A Beachcombers! 1/2 Oz & 1oz Soft Squeeze Fine Metal Tip Moroccan Blunt Needle Syringe Type Body Art Henna Tattoo Applicators, 5 Tips 4 Bottles would probably be even better. > The air gap is literally a "gap", that is, an open space, or "well", located is beneath the lever, opposite the giraffe neck. For access to Premier faucets with flat sides (without an access hole on the side), pull the giraffe neck straight up and out, then slide the lever forward (in the direction of the giraffe neck). Drip few drops of Clorox into the "well" Do NOT disturb the small black plastic insert---it is the tiny "faucet" where the red water line discharges "brine" into the air gap or "well". To reassemble, push the lever backward (in the direction of the air gap), so that the legs slide under the "T", and then push the giraffe neck back into place. In Premier faucets which have domed bodies (without the flat sides), the air gap is accessible via a hole on the same side as the lever---perhaps for the very purpose of making the air gap easier to sanitize. If you install a domed-body faucet with the lever toward the sink, the hole is most easily accessible. > Click on β€œStoney” just below the product title to see my other reviews, or leave a comment to ask questions. ## Features - 50 GPD MEMBRANE FILTER: Experience perfectly filtered water with the Watts Premier 50 GPD Membrane Replacement, designed to work seamlessly with Watts Premier reverse osmosis filtration systems, specifically with 4SV/4-Stage (WP500025), 5SV/5-Stage (WP500032), and Zero Waste (WP0950045). Please note that it is not compatible with Quick Change reverse osmosis systems. - HIGHLY EFFECTIVE FILTRATION: This advanced semi-permeable membrane filter effectively reduces TDS (Total Dissolved Solids) and sodium, as well as a wide range of contaminants, such as arsenic, lead, percolate, chromium, copper, and radium. Moreover, with the ability to filter impurities down to 1/10,000 of a micron, this significantly enhances the purity of your drinking water by removing microscopic contaminants. - EASY INSTALLATION: Measuring 1.8" in diameter and 10.75" in length, this membrane is designed for easy and straightforward installation and replacement in under-sink water filtration systems. It also features a check valve built directly into the membrane for efficient performance. - LONG-LASTING PERFORMANCE: Crafted with high-quality materials, this membrane filter is engineered to provide superior, long-lasting performance. It has a filter rating of 2 to 5 years, but membrane life may vary based on local water conditions, use patterns, and frequency of filter changes. - THE PREMIER DIFFERENCE: Since our founding in 1989, Premier has been dedicated to the design, development, and marketing of high-quality water filtration systems that exceed industry standards. Following our Watts Water Technologies in 2001, our audience and influence have only expanded, solidifying Watts Premier as a trusted leader in the industry. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B00AJG8JUS | | Best Sellers Rank | #47,091 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #325 in Replacement Under-Sink Water Filters | | Brand | Watts Premier | | Brand Name | Watts Premier | | Customer Reviews | 4.6 out of 5 stars 1,527 Reviews | | EU Spare Part Availability Duration | 2 Years | | External Testing Certification | ANSI, NSF | | Global Trade Identification Number | 00099351560189, 00783583786416 | | Included Components | membrane | | Item Dimensions D x W x H | 2.5"D x 2.5"W x 12"H | | Item Type Name | Membrane Replacement for Premier Standard Reverse Osmosis System, Built-In Check Valve, 1.8" Dia x 10.75" L | | Item Weight | 6.4 ounces | | Manufacturer | Watts | | Manufacturer Part Number | 560018 | | Material | Copper | | Material Type | Copper | | Model Number | WP560018 | | Number of Items | 1 | | Product Benefits | Reduces odor and harmful chemicals in water by up to 99.8% | | Product Dimensions | 2.5"D x 2.5"W x 12"H | | Set Name | 4SV/4-Stage (WP500025), 5SV/5-Stage (WP500032), Zero Waste (WP0950045) | | UPC | 702877370728 099351560189 696750375538 785577675713 783583786416 | | Unit Count | 1.0 Count | ## Product Details - **External Testing Certification:** ANSI, NSF - **Item Weight:** 0.4 Pounds - **Material:** Copper - **Product Benefits:** Reduces odor and harmful chemicals in water by up to 99.8% - **Product Dimensions:** 2.5"D x 2.5"W x 12"H ## Images ![Watts Premier RO Water Filter 50 GPD (Gallons Per Day) Semi-Permeable Membrane Replacement for Premier Standard Reverse Osmosis System, Yellow, Built-In Check Valve, 1.8" Dia x 10.75" L, 1-Pack - Image 1](https://m.media-amazon.com/images/I/61gvNhzimkL.jpg) ![Watts Premier RO Water Filter 50 GPD (Gallons Per Day) Semi-Permeable Membrane Replacement for Premier Standard Reverse Osmosis System, Yellow, Built-In Check Valve, 1.8" Dia x 10.75" L, 1-Pack - Image 2](https://m.media-amazon.com/images/I/61O94PZfKBL.jpg) ![Watts Premier RO Water Filter 50 GPD (Gallons Per Day) Semi-Permeable Membrane Replacement for Premier Standard Reverse Osmosis System, Yellow, Built-In Check Valve, 1.8" Dia x 10.75" L, 1-Pack - Image 3](https://m.media-amazon.com/images/I/510a0ZQ7uaL.jpg) ![Watts Premier RO Water Filter 50 GPD (Gallons Per Day) Semi-Permeable Membrane Replacement for Premier Standard Reverse Osmosis System, Yellow, Built-In Check Valve, 1.8" Dia x 10.75" L, 1-Pack - Image 4](https://m.media-amazon.com/images/I/61JDIGuXsNL.jpg) ![Watts Premier RO Water Filter 50 GPD (Gallons Per Day) Semi-Permeable Membrane Replacement for Premier Standard Reverse Osmosis System, Yellow, Built-In Check Valve, 1.8" Dia x 10.75" L, 1-Pack - Image 5](https://m.media-amazon.com/images/I/61uDEmOGmhL.jpg) ## Available Options This product comes in different **Color, Style** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ A must for WATTS to drop TDS and PPM!!! *by M***Y on November 15, 2024* This filter is a must for WATTS 5 stage RO (WP5-50) to drop the TDS and PPM!!! My Watts RO is about 10 years old that I originally bought from Amazon and it still works great; I have gone through two faucets, two water tanks and about 2-3 of these RO membrane filters but the system works great. This 50GPD membrane is the heart of the RO system as it plays a key role in removing TDS and sodium as well as a wide range of contaminants such as arsenic, lead, chlorine, chromium, copper etc. reducing impurities down to 1/10,000 of a micron from the water that passes through the sediment and carbon filters first. Hence this membrane filter only needs to be replaced once every 2-3 years depending on your TDS levels while the other ones need replacement every 6-12 months again depending on your local water source. My area has good water and hence our filters last more than a year sometimes. I purchased a cheap TDS meter and tested my tap water at 35 PPM, while the water from the old RO filters at 31 PPM. But after changing all the filters 4 filters it came down to 2 PPM after discarding about 2 tanks of water. Overall, a very good system and filter!!! ### ⭐⭐⭐⭐⭐ > DOES THE JOB *by S***Y on May 20, 2015* DESCRIPTION > Color: yellow. All yellow Premier filters are the same size and fit in the same housing. They come in 18, 24, 36, and 50 g/d capacities. You need to match the capacity to your system. My understanding is that if you install a higher capacity membrane, you may have to add a flow limiter to your system. As it turned out for me, my old membrane was a 36 g/d membrane---but the system seems to work well with the 24 g/d membrane. Note also that the black rubber gasket of my 10-year old membrane was at the other end, but does not seem to matter. > This filter is 24 gallons per day, which you should check to see if it matches your existing system. > Genuine Watts #11009---which is important because Watts membranes have a built-in check valve. If you use a non-watts membrane, you may have to add a check-value to your system. > Measurements: 11 1/2" long overall; body 1 3/4" diameter; to fit in a 2" diameter tube > Comes with instructions, which aren't great. But did not exactly apply to my 25-year old Watts Premier system, because the housing of more modern Premier RO systems has been redesigned. I needed to grab the end of the old filter with pliers to pull it out. One end has two O-rings (shown in the photo on the far lower right), the other does not have O-rings but is notched. Pay attention to which way your old membrane was installed. It is as good idea to take photos with your cell phone for each step in disassembly. SUGGESTIONS > Consider replacing all the other filters at the same time---you'll get more life out of the membrane. > I suggest that you start any maintenance by cleaning the black waste-line (so that later cleaning will not accidentally contaminate your new filters). See below. > Consider replacing your tank at the same time---the rubber diaphragm in the tank has a limited life (probably 5--10 years). > Silicon grease is perfect for lubricating the O-rings for the best seal. However, you don't want silicon grease to leach into your drinking water. So if you use silicon grease on the O-rings, be sure to wipe off all excess---just a few molecules thick will do the job. Permatex PERMATEX DIELECTRIC GREASE 22058 > Silicon grease is also helpful on all the "threads" where the filter housings screw together---it allows you to easily tighten them tighter that you could easily otherwise---and when it comes time to replace the filters, the housings should unscrew easier. PREMIER RO WASTE-LINE MAINTENANCE---a good idea to do before you install the membrane filter. > After about 6 months of use, the black waste-water tube can become clogged with a bacterial mat. If you pay attention, there is an odd choking gurgling sound when the tube is almost clogged. When it is clogged, the waste water will leak from the faucet itself out onto your counter. The solution (i.e., to prevent clogging of the line) is to regularly clean-out the black waste-water line. An 18" length of "weed-whacker" cord works well. Detach the black tube from your sink waste-line, and feed the "weed-whacker cord" into the tube and scrub it out. If you've had a root-canal procedure, you know how it's done. Note that the bacterial mat is a nasty sludge---have an old cloth towel handy to catch the gunk. > About 1 1/2 years ago I purchased a "beer line brush" Draft Beer Line Hose Cleaning Brush: 3/16" diameter, which worked well the one time I used it (the 1/4" diameter model might work better). However, it also occurred to me that I could squirt a few drops of Clorox into the air gap to prevent the bacterial mat from forming. Since I've been doing that once every few months, the waste line has not clogged up, so, I haven't needed to use the brush. The following bottle, which works well for this purpose is $3 at the Container Store Nalgene Plastic Drop Bottle. A Beachcombers! 1/2 Oz & 1oz Soft Squeeze Fine Metal Tip Moroccan Blunt Needle Syringe Type Body Art Henna Tattoo Applicators, 5 Tips 4 Bottles would probably be even better. > The air gap is literally a "gap", that is, an open space, or "well", located is beneath the lever, opposite the giraffe neck. For access to Premier faucets with flat sides (without an access hole on the side), pull the giraffe neck straight up and out, then slide the lever forward (in the direction of the giraffe neck). Drip few drops of Clorox into the "well" Do NOT disturb the small black plastic insert---it is the tiny "faucet" where the red water line discharges "brine" into the air gap or "well". To reassemble, push the lever backward (in the direction of the air gap), so that the legs slide under the "T", and then push the giraffe neck back into place. In Premier faucets which have domed bodies (without the flat sides), the air gap is accessible via a hole on the same side as the lever---perhaps for the very purpose of making the air gap easier to sanitize. If you install a domed-body faucet with the lever toward the sink, the hole is most easily accessible. > Click on β€œStoney” just below the product title to see my other reviews, or leave a comment to ask questions. ### ⭐⭐⭐⭐⭐ Watts Premier membrane is a great product *by A***R on July 25, 2025* Watts Premier membrane is a great product, good price/value ## Frequently Bought Together - Watts Premier RO Water Filter 50 GPD (Gallons Per Day) Semi-Permeable Membrane Replacement for Premier Standard Reverse Osmosis System, Yellow, Built-In Check Valve, 1.8" Dia x 10.75" L, 1-Pack - Watts Premier Annual 7-Pack Standard Water Filter Replacement Kit for RO-TFM-5SV, WP-ST6DM, WP-5, WP5-50 Reverse Osmosis System, 2 Sediment Filters, 4 Carbon Pre-Filters, GAC Inline Post-Filter - Watts Premier Bi-Annual Standard RO 5-Stage & 6-Stage Premium Carbon Block Filtration Kit for Reverse Osmosis System, Sediment Filter, 2 Carbon Pre-Filters, 10" GAC Inline Post-Filter, Housing Wrench --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.jp/products/25898180-watts-premier-ro-water-filter-50-gpd-gallons-per-day](https://www.desertcart.jp/products/25898180-watts-premier-ro-water-filter-50-gpd-gallons-per-day) --- *Product available on Desertcart Japan* *Store origin: JP* *Last updated: 2026-05-23*