---
product_id: 746325183
title: "Waterdrop T4-A Alkaline pH+ Reverse Osmosis Water Filter, Dual Flow, NSF/ANSI 372 Certified, 10-Stage, 450 GPD Tankless Undersink RO Filtration System, 2:1 Pure to Drain, BPA Free, Plug-in Required"
brand: "waterdrop"
price: "¥96909"
currency: JPY
in_stock: true
reviews_count: 8
category: "Waterdrop"
url: https://www.desertcart.jp/products/746325183-waterdrop-t4-a-alkaline-ph-reverse-osmosis-water-filter-dual
store_origin: JP
region: Japan
---

# Smart filter life alerts 450 GPD ultra-fast flow Dual purified & alkaline streams Waterdrop T4-A Alkaline pH+ Reverse Osmosis Water Filter, Dual Flow, NSF/ANSI 372 Certified, 10-Stage, 450 GPD Tankless Undersink RO Filtration System, 2:1 Pure to Drain, BPA Free, Plug-in Required

**Brand:** waterdrop
**Price:** ¥96909
**Availability:** ✅ In Stock

## Summary

> 💦 Elevate your hydration game with next-level purity and style!

## Quick Answers

- **What is this?** Waterdrop T4-A Alkaline pH+ Reverse Osmosis Water Filter, Dual Flow, NSF/ANSI 372 Certified, 10-Stage, 450 GPD Tankless Undersink RO Filtration System, 2:1 Pure to Drain, BPA Free, Plug-in Required by waterdrop
- **How much does it cost?** ¥96909 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/746325183-waterdrop-t4-a-alkaline-ph-reverse-osmosis-water-filter-dual)

## Best For

- waterdrop enthusiasts

## Why This Product

- Trusted waterdrop brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Tankless Space-Saver:** Compact design frees up 70% more under-sink space while preventing secondary contamination.
- • **Eco-Friendly Efficiency:** Industry-leading 2:1 pure to drain ratio reduces wastewater by up to 800% compared to traditional RO systems.
- • **Hassle-Free Maintenance:** LED indicators and buzzer alerts keep you ahead of filter replacements—never miss a change.
- • **Dual Flow, Dual Benefits:** Switch seamlessly between pure RO water and mineral-rich alkaline water for tailored hydration.
- • **10-Stage Precision Filtration:** Eliminates PFOA, PFOS, chlorine, heavy metals, and more for crystal-clear, great-tasting water.

## Overview

The Waterdrop T4-A is a cutting-edge, NSF/ANSI 372 certified 10-stage reverse osmosis system featuring dual flow for both purified and alkaline water. Delivering an impressive 450 gallons per day with a tankless design, it maximizes under-sink space and minimizes wastewater with a 2:1 pure-to-drain ratio. Smart filter life reminders and BPA-free materials ensure convenience and safety, making it the ultimate upgrade for health-conscious professionals seeking premium water quality.

## Description

Product description Replacement Filters for WD-T4-A RT-2CFCBALK Filter RT-2CFCBALKRO Filter RT-CF Filter RT-CB Filter RT-ALK Filter RT-450RO Filter

Review: Review: Clean Water, Clear Conscience — A Case for Tankless Reverse Osmosis - In a marketplace saturated with convenience, bottled water has long sold an illusion: purity wrapped in plastic, convenience priced at a premium. This tankless reverse osmosis, alkaline mineralized filtration system quietly dismantles that illusion — and replaces it with something far more rational. At its core, this system is about control. It brings water purification out of the supply chain and into the home, where it belongs. No hauling cases up stairs. No storage clutter. No recurring expense disguised as habit. Just a steady, immediate supply of clean, well-balanced drinking water. The performance is where it earns its credibility. Reverse osmosis does the heavy lifting — stripping away contaminants, dissolved solids, and impurities with precision. What remains is then rebalanced through mineralization, restoring a clean, neutral taste and a stable pH that feels natural rather than sterile. The result is water that is not only safe, but genuinely enjoyable to drink. The tankless design is more than a technical upgrade; it is a practical one. By eliminating the storage tank, the system reduces the risk of stagnation and improves efficiency. Water flows fresh, on demand, without the footprint or maintenance concerns of older designs. It is a modern solution to an old problem. Installation, often a barrier for home systems, proves refreshingly straightforward. The process requires access to a power source beneath the sink and the willingness to drill a clean, precise hole in the countertop for the dedicated faucet. With a hole saw drill bit, a screwdriver, and a utility knife to trim hoses to size, the setup is manageable for anyone with basic DIY confidence. The steps are logical, the fittings intuitive, and the result feels earned rather than engineered by frustration. Then there is the environmental reality. Bottled water is, in blunt terms, an exercise in unnecessary waste — a cycle of extraction, packaging, transport, and disposal that leaves behind a trail of plastic with a lifespan far longer than its usefulness. This system interrupts that cycle at the source. Each glass poured at home is one less bottle produced, shipped, and discarded. Cost, too, tells a quiet truth. What appears inexpensive at the store compounds quickly over time. A filtration system like this reframes water not as a product to be purchased repeatedly, but as a utility — accessible, consistent, and far more economical in the long run. This is not a luxury appliance. It is a correction. Verdict: For those willing to step out of the bottled-water habit, a tankless reverse osmosis system offers a compelling alternative — cleaner water, lower long-term cost, and a meaningful reduction in plastic waste. In both personal and environmental terms, it is a decision that carries its own kind of clarity.
Review: WD-T4-A after installation - We bought the Waterdrop WD-T4-A Alkaline RO System a week ago and it has completely changed the quality of our drinking water. Installation was shockingly simple for a tankless RO system—I had it set up and running in under an 30 minutes, thanks to the clear instructions. ​The difference in taste is night and day. Our tap water was always heavily chlorinated, but this system removes that entirely. The alkaline feature is a huge bonus; the water tastes perfectly crisp and clean, almost better than expensive bottled water. ​The flow rate is also incredible; it fills a pitcher in no time, which is something older, tanked systems simply can't do. If you're looking for a compact, high-performance, and water-saving RO system, this is absolutely the one to get. Worth every penny!

## Features

- [Dual Water Flow]: The WD-T4-A RO system offers two purified water options: a standard RO-purified stream and a mineral-enhanced alkaline stream. Switch between them effortlessly based on your needs — both deliver contaminant-reduced drinking water. Dual LED ensure complete water safety from filtration to faucet *NOTE: Faucet installation requires drilling holes in the countertop
- [10-Stage Filtration with RO Membrane]: This system reduces harmful substances, including PFOA & PFOS, chlorine, heavy metals, rust, colloids and more impurities, through its comprehensive filtration stages. The dedicated mineral-enriched line then infuses beneficial alkaline minerals, delivering healthier, great-tasting water. 𝐍𝐨𝐭𝐞: This system requires an electrical connection for operation
- [450GPD Flow & 2:1 Pure to Drain]: With a 450-gallon-per-day capacity and industry-leading 2:1 water-saving ratio, the WD-T4-A provides fast, on-demand purified water while reducing wastewater by up to 800% compared to traditional RO systems
- [Smart Filter Life Reminder]: You won't miss a filter change with the indicator lights and buzzer alerts. Replacement intervals: CF filter: 6 months; RO membrane: 24 months; CB filter: 12 months; Alkaline mineralizer: 12 months
- [Tankless Design]: The compact, tank-free system effectively avoids secondary contamination risks associated with water storage tanks, while freeing up 70% more under-sink space than traditional tank-based RO systems

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0F5V9G355 |
| Best Sellers Rank | #10,084 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #23 in Under-Sink & Countertop Filtration |
| Brand | Waterdrop |
| Brand Name | Waterdrop |
| Capacity | 450 Gallons |
| Customer Reviews | 4.6 out of 5 stars 331 Reviews |
| Included Components | RO System (CF*1, CB*1, ALK*1, RO*1, Faucet) |
| Item Dimensions L x W x H | 16.54"L x 6.22"W x 17.95"H |
| Item Weight | 10.98 Kilograms |
| Manufacturer | Waterdrop |
| Material | Reverse Osmosis |
| Material Type | Reverse Osmosis |
| Model Name | WD-RT44D-WAD |
| Model Number | WD-RT44D-WAD |
| Other Special Features of the Product | Alkaline 450GPD Tankless RO, 10-Stage, NSF/ANSI 372 Certified, 2:1 Pure to Drain, Plug-in required |
| Part Number | WD-RT44D-WAD |
| Product Dimensions | 16.54"L x 6.22"W x 17.95"H |
| Special Feature | Alkaline 450GPD Tankless RO, 10-Stage, NSF/ANSI 372 Certified, 2:1 Pure to Drain, Plug-in required |
| Unit Count | 1.0 Count |

## Product Details

- **Brand:** Waterdrop
- **Capacity:** 450 Gallons
- **Included Components:** Tankless RO ( CF Filter, CB Filter, ALK Filter, RO Filter ), Dual Flow Faucet
- **Item Weight:** 10.98 Kilograms
- **Manufacturer:** Waterdrop
- **Material:** Reverse Osmosis
- **Model Name:** WD-RT44D-WAD
- **Product Dimensions:** 16.54"L x 6.22"W x 17.95"H
- **Special Feature:** Alkaline 450GPD Tankless RO, 10-Stage, NSF/ANSI 372 Certified, 2:1 Pure to Drain, Plug-in required

## Images

![Waterdrop T4-A Alkaline pH+ Reverse Osmosis Water Filter, Dual Flow, NSF/ANSI 372 Certified, 10-Stage, 450 GPD Tankless Undersink RO Filtration System, 2:1 Pure to Drain, BPA Free, Plug-in Required - Image 1](https://m.media-amazon.com/images/I/719YgI8NGvL.jpg)
![Waterdrop T4-A Alkaline pH+ Reverse Osmosis Water Filter, Dual Flow, NSF/ANSI 372 Certified, 10-Stage, 450 GPD Tankless Undersink RO Filtration System, 2:1 Pure to Drain, BPA Free, Plug-in Required - Image 2](https://m.media-amazon.com/images/I/71OQtk6kPNL.jpg)
![Waterdrop T4-A Alkaline pH+ Reverse Osmosis Water Filter, Dual Flow, NSF/ANSI 372 Certified, 10-Stage, 450 GPD Tankless Undersink RO Filtration System, 2:1 Pure to Drain, BPA Free, Plug-in Required - Image 3](https://m.media-amazon.com/images/I/71x7GB9GBnL.jpg)
![Waterdrop T4-A Alkaline pH+ Reverse Osmosis Water Filter, Dual Flow, NSF/ANSI 372 Certified, 10-Stage, 450 GPD Tankless Undersink RO Filtration System, 2:1 Pure to Drain, BPA Free, Plug-in Required - Image 4](https://m.media-amazon.com/images/I/81hLFOKNC6L.jpg)
![Waterdrop T4-A Alkaline pH+ Reverse Osmosis Water Filter, Dual Flow, NSF/ANSI 372 Certified, 10-Stage, 450 GPD Tankless Undersink RO Filtration System, 2:1 Pure to Drain, BPA Free, Plug-in Required - Image 5](https://m.media-amazon.com/images/I/816NJ5fkJuL.jpg)

## Available Options

This product comes in different **Set** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review: Clean Water, Clear Conscience — A Case for Tankless Reverse Osmosis
*by C***T on April 12, 2026*

In a marketplace saturated with convenience, bottled water has long sold an illusion: purity wrapped in plastic, convenience priced at a premium. This tankless reverse osmosis, alkaline mineralized filtration system quietly dismantles that illusion — and replaces it with something far more rational. At its core, this system is about control. It brings water purification out of the supply chain and into the home, where it belongs. No hauling cases up stairs. No storage clutter. No recurring expense disguised as habit. Just a steady, immediate supply of clean, well-balanced drinking water. The performance is where it earns its credibility. Reverse osmosis does the heavy lifting — stripping away contaminants, dissolved solids, and impurities with precision. What remains is then rebalanced through mineralization, restoring a clean, neutral taste and a stable pH that feels natural rather than sterile. The result is water that is not only safe, but genuinely enjoyable to drink. The tankless design is more than a technical upgrade; it is a practical one. By eliminating the storage tank, the system reduces the risk of stagnation and improves efficiency. Water flows fresh, on demand, without the footprint or maintenance concerns of older designs. It is a modern solution to an old problem. Installation, often a barrier for home systems, proves refreshingly straightforward. The process requires access to a power source beneath the sink and the willingness to drill a clean, precise hole in the countertop for the dedicated faucet. With a hole saw drill bit, a screwdriver, and a utility knife to trim hoses to size, the setup is manageable for anyone with basic DIY confidence. The steps are logical, the fittings intuitive, and the result feels earned rather than engineered by frustration. Then there is the environmental reality. Bottled water is, in blunt terms, an exercise in unnecessary waste — a cycle of extraction, packaging, transport, and disposal that leaves behind a trail of plastic with a lifespan far longer than its usefulness. This system interrupts that cycle at the source. Each glass poured at home is one less bottle produced, shipped, and discarded. Cost, too, tells a quiet truth. What appears inexpensive at the store compounds quickly over time. A filtration system like this reframes water not as a product to be purchased repeatedly, but as a utility — accessible, consistent, and far more economical in the long run. This is not a luxury appliance. It is a correction. Verdict: For those willing to step out of the bottled-water habit, a tankless reverse osmosis system offers a compelling alternative — cleaner water, lower long-term cost, and a meaningful reduction in plastic waste. In both personal and environmental terms, it is a decision that carries its own kind of clarity.

### ⭐⭐⭐⭐⭐ WD-T4-A after installation
*by A***I on October 26, 2025*

We bought the Waterdrop WD-T4-A Alkaline RO System a week ago and it has completely changed the quality of our drinking water. Installation was shockingly simple for a tankless RO system—I had it set up and running in under an 30 minutes, thanks to the clear instructions. ​The difference in taste is night and day. Our tap water was always heavily chlorinated, but this system removes that entirely. The alkaline feature is a huge bonus; the water tastes perfectly crisp and clean, almost better than expensive bottled water. ​The flow rate is also incredible; it fills a pitcher in no time, which is something older, tanked systems simply can't do. If you're looking for a compact, high-performance, and water-saving RO system, this is absolutely the one to get. Worth every penny!

### ⭐⭐⭐⭐⭐ A Great buy
*by M***J on April 28, 2026*

A very effective reverse osmosis system at an affordable price. The T4-A RO system has effectively reduced the number of suspended solids and contaminant on the city water on my house in Northern Illinois even lower than the commercial water refill from our local Walmart. I also took water samples and have it tested to compare the City water vs the water from this T4-A. The system is also very easy to install and took me about 1-hour to install and this includes the 30 minute required for the initial start-up flush. Another benefit I saw is this system have filtered out heavy metals and PFAS (micro plastic) which was found on trace amount on the city water. This system also has the option to give you Mineralized water if so desired. For comparison the T4-A is a tankless system and does not need to do a regeneration cycle compared to RO system with tanks. So far, I have measured the T4-A flowrate at 0.40 gallon per minute. This unit also have a Ultra-violet system but I am not sure how helpful this will be since the dwell time of the water will be short. The only concert I do have on this unit is the availability of the pump or parts if something broke. I do see there are available filters though. To summarize- I highly recommend. Update- I have sent a few questions regarding the Waterdrop T4-A unit and Rosie from customer service has done an excellent job in answering my questions. My RO unit has been working very well saving me a lot of time and money vs buying bottled water.

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-05-12*