[Dual Flow] Waterdrop WD-T4-A Alkaline pH+ Reverse Osmosis Water Filter, NSF/ANSI 372 Certified, 10-Stage, 450GPD Tankless Undersink RO Filtration System, 2:1 Pure to Drain, BPA Free, Plug-in required

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!

The pump is very quiet compared to other countertop systems I’ve installed, and the dual functionality is convenient without taking up extra space. The alkaline water tastes clean and noticeably better than standard tap or basic filtered water. Flow rate is consistent and installation was straightforward with no leaks. Controls are simple and it’s easy to switch modes depending on what you need. Overall, a solid system if you want quiet operation, good output, and better-tasting drinking water.

Great product , easy installation

Honestly, it's a very good product; simple to install, very easy; it arrived in perfect condition with all the correct parts; and above all, the water filtration quality and taste are very good; the motor is extremely quiet; and the parts are of good quality; the indicator screen is a nice touch. Seriously, for this price you can't ask for better. I recommend it.

I’m really impressed with this purchase. The quality is excellent, everything works exactly as described, and it’s clear a lot of thought went into the design. It arrived well‑packaged, easy to set up, and has been completely reliable. It’s rare these days to buy something that just does what it’s supposed to do without any hassle. Highly recommend. I installed this in my basement mechanical room and ran a line to my upstairs refrigerator, water filling through the door is a little bit slower, but that is the price for ultra filtered water.

WDT4A. Installed on 2/15/26. Impossible to get help online or on the phone. TDS readings are high on 1st gallons coming out. But then levels off to about 12RO and 42Alka. Why do I need to run 1 gallon on each line before water tests reasonable. A waste.

Great product and outstanding customer service. My agent--Rosie--was the very best customer representative I have ever worked with from ANY company. She was very kind, courteous, knowledgeable, and professional. She went out of her way to resolve my issue and beyond. I could not be more satisfied with her performance. Also, the Waterdrop unit that I purchased is the very best RO filtration system I have owned. It is well designed, constructed, and effective at generating quality water that tastes great. I also really like the dual-flow functionality. GREAT PRODUCE, GREAT SERVICE.

I absolutely love this Waterdrop. I have a fountain with regular RO on the left and the Oakland water on the right. Flow is good, water tastes great. Just so easy to use. I got tired of my Berkey filter system. Filter replacements for Waterdrop will be so much easier and I do not have to mess with it very often once a year for most of the filters. So far, I just love it.