Does it constantly discharge reject water even when your not using pure water

YES, you need to close both outputs or water will discharge from the brine. To stop it from running constantly most use an ASV (Automatic shutoff valve). You will also need a flow restrictor on the Brine, sized appropriately for the RO membrane

what is the wastewater to purified water ratio? can the flow restrictor be bypassed to flush?

The purified water to wastewater ratio is 1/2.

Why waste water line seems to be running a lot of water ?

Waste water is usually 1gallon RO/DI to 2 to 4 gallons waste. I brought my waste to 1 -2 gallaons of waste to 1 gallon Ro/DI with a booster pump. I also added and upgradeed from 100G to 200Gallon system. Just added another 100G ro/di canister. use the waste water for plants, and garden. If ypu can get waste tube to go out and into a diffrent barrel or yard, you can recycle it. booster pump helps to reduce the waste, unfortunately there is no other way to completely reduce it to zero. good luck.

Can you suggest asov for the 400g system? it has 3/8 input x 1/4 output - all of the asov on amazon are 1/4 x 1/4 or (rare) 3/8/ x 3/8

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Membrane Solutions 75 GPD RO Membrane, Reverse Osmosis Membrane with Membrane Housing, Wrench, 1/4" Quick-Connect Fittings, Check Valve, Replacement for Under Sink Home Drinking RO Water Filter System

Product ID: 144929098

Details

External Testing Certification
ANSI NSF
Item Weight
14.4 ounces
Material
Polyamide
Product Dimensions
2"D x 2"W x

💧75 GPD purified water output

🔬97% contaminant rejection rate

🛠️Complete DIY kit with wrench & fittings

¥14547

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Description

💧 Pure water, pure power—upgrade your hydration game today!

HYDRATE LIKE A PRO - Produces up to 75 gallons of crystal-clear water daily—stay refreshed without limits.
VERSATILE RELIABLE - Standard size fits under-sink systems, perfect for kitchens, aquariums, or even maple syrup DIY projects.
NEXT LEVEL FILTRATION - Removes 97% of dissolved solids, heavy metals, and harmful minerals for pure, confident hydration.
DIY INSTALLATION MADE EASY - Includes membrane housing, wrench, and quick-connect fittings for a seamless setup—no plumber needed.
LAB TESTED QUALITY ASSURANCE - Crafted with premium Polyamide Thin-Film Composite and independently verified for peak performance.

The Membrane Solutions 75 GPD RO Membrane kit delivers professional-grade reverse osmosis filtration, producing up to 75 gallons of purified water daily. Engineered with advanced Polyamide Thin-Film Composite technology, it removes up to 97% of total dissolved solids including heavy metals. This all-in-one DIY kit includes membrane housing, wrench, quick-connect fittings, and a check valve, enabling easy installation under your sink. Independently lab-tested and ANSI/NSF certified, it ensures reliable, high-quality water filtration for home, aquarium, or specialty uses like maple syrup processing.

Specifications

ASIN	B07H31GYTT
Best Sellers Rank	#237,358 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #1,620 in Replacement Under-Sink Water Filters
Brand Name	Membrane Solutions
Customer Reviews	4.4 4.4 out of 5 stars (566)
External Testing Certification	ANSI, NSF
Global Trade Identification Number	00850071881929
Item Dimensions D x W x H	2"D x 2"W x 12"H
Item Weight	14.4 ounces
Manufacturer	Membrane Solutions
Manufacturer Part Number	ROSL1812-75G
Material Type	Polyamide Thin-Film Composite
Model Number	ROSL1812-75G
Number of Items	1
Product Benefits	High rejection rate for lower TDS, standard size for various usages like kitchen, maple syrup DIY, and aquariums.
Set Name	75 GPD Kit
UPC	850071881929
Unit Count	1.0 Count

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¥14547

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In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Japan.

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TrustScore 4.5 | 7,300+ reviews

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