Cloud

Cloud RO

Ranked #1 in Reverse Osmosis Systems

1099 LP on the category ladder what's LP?

Wirecutter's top pick specifically for reliability and simplicity, with a support reputation that matches. The safest long-term ownership in the category.

Consolidated from 25 cited sources across 17 outlets

Where the cited sources landed, as we read them

22 positive sources
3 mixed sources

See the sources

Flagged as a product to avoid

1 of 12 research runs entered this as a product to avoid rather than a pick.

Wirecutter's own coverage flags that the high performance comes at a high price plus a hefty annual filter bill on top. It makes excellent water, but an iSpring RCC7 or Waterdrop G3P600 does the same for a fraction of the outlay.
Flagged 17 September 2026

Why the boards include products to avoid

Check price

Pros & cons

✓ Tank-based design with no pump or electronics to fail
✓ Quick-change filters
✓ Attentive support team
✓ Rated the best under-sink RO system by multiple outlets
✓ Built-in remineralization

✗ Costs more than the tank workhorses
✗ One independent reviewer has documented gaps in what Wirecutter's testing covered
✗ Premium price
✗ High price relative to rivals that produce the same water quality
✗ Hefty annual filter bill on top of the purchase

The sources behind this ranking

We searched the web and YouTube for what has been published about this product, then read the articles, video transcripts and comments we found.

Evidence 11 articles, 9 video reviews and 5 community sources

22 positive sources

W r/WaterTreatment u/aardlarks · owner

Going to be straight with you, the data points pretty clearly toward Cloud RO between these two, and not for the smart features. Here's how they actually performed in my lab testing. Cloud RO scored 9.25/10 overall, iSpring RCC7 scored 6.64/10. The gap is mostly driven by contaminant reduction performance. Cloud RO removed 100% of disinfection byproducts, fluoride, copper, aluminum, manganese, molybdenum, and strontium in my Colorado tap water. NSF 58 certified for TDS reduction, materials safety certified. The iSpring RCC7 is where it gets concerning. It also reduced most contaminants well, but it introduced two new contaminants into my water that weren't there before filtration. Arsenic post-filtration measured at 0.003 PPM (the HGL is 0).

Read thread M Michael Kummer Michael Kummer · 135K subscribers · Mar 2024

Cloud RO is a game-changing reverse-osmosis filtration system that purifies and remineralizes drinking water.

Watch N

Nytimes Article

The app is easy to connect and gives useful monitoring information. The Cloud RO connects via Bluetooth to your phone. Unlike with many other wireless-connected devices I’ve tested, setup was quick and trouble-free. The Cloud RO app provides a reading of total dissolved solids, indicates the filter’s performance (or problems with it), and issues alerts when the time is approaching to replace the filters. It’s simple, nonintrusive, and actionable.

Read W Water Filter Guru Water Filter Guru · 85.5K subscribers · Aug 2024

0:00 - This Reverse Osmosis Water Filter System BLEW MY MIND 🤯

Watch B

Boredmom Article

It’s quickly becoming known as the Mercedes of Reverse Osmosis as it’s a truly complete purified water system. We were spending $55 a month on Spring Water delivery, so this system pays for itself in a year – but no more bottle hassle or plastic bottles!

Read W Water Filter Guru Water Filter Guru · 85.5K subscribers · Jun 2026

The result? A contaminant reduction score of 9.42 and complete removal of all contaminants detected above health guideline levels in both tests, including fluoride, uranium, and disinfection byproducts.

Watch Y

Yahoo Health Korin Miller · reviewer · Sept 2026

In recent rankings from Water Filter Guru, the Cloud RO was the fourth highest-scoring under-sink water filtration system. The system is certified to NSF/ANSI Standard 58 for TDS reduction, which covers its RO membrane performance and materials safety.

Read W Water Filter Guru Water Filter Guru · 85.5K subscribers · Aug 2026

Cloud RO stands out from other conventional under-sink RO systems with its easy installation and impressive water efficiency. Installation took just 45 minutes, while testing showed an almost 1:1 pure-to-drain ratio.

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The Filtery Article · Mar 2026

Cloud RO is not only sleep and easy-to-install, but it also has a companion app that tracks water quality, consumption, and filter life in real time. So you’ll never have to worry about missing a filter change or wondering if something is wrong.

Read W Water Filter Guru Water Filter Guru · 85.5K subscribers · Aug 2026

Cloud RO has one of the most premium look and feel of any conventional RO I've tested.

Watch T

Truemed Article

Meet Cloud RO — a smart under-sink reverse osmosis system that removes 99% of toxins including PFAS, heavy metals, microplastics, and fluoride. Enjoy pure, great-tasting alkaline water straight from your tap with Cloud RO.

Read B Bored Mom Bored Mom · 1.6K subscribers · Oct 2024

The Cloud RO system removes 99% of the toxins (PFAS, fluoride, pharmaceuticals) in our water.

Watch Q

QWL Mike Martin · reviewer · Mar 2026

We’d buy Cloud RO again for our kitchen. The standard remineralization, battery-powered installation, useful app, five-year warranty, and 99/99 result after 12 months make it the better everyday system for us.

Read A Alpaca Home Improvement Alpaca Home Improvement · 43 subscribers · Aug 2025

Cloud RO removes up to 99% of contaminants including PFAS, lead, fluoride, pharmaceuticals, and pesticides, and even remineralizes the water to pH 8–9 for better taste and health

Watch W

Water Filter Guru Brian Campbell · reviewer · Jul 2020

The system has a fairly high price tag at around $650, so it’s on the more expensive end for a point-of-use filter, but the price is fair for what you get.

Read F Facebook waterfilterguru

The Cloud RO takes the classic tank-based reverse osmosis design and gives it a modern upgrade.

View post G

Good Housekeeping Olivia Lipski · reviewer · May 2026

The Cloud Water Filter is compact, app-connected, and delivers noticeably better-tasting water.

Read F Facebook waterfilterguru

The Cloud RO doesn't just filter your water—it helps you take care of the system too.

View post Q

Qualitywaterlab Article · Apr 2022

Cloud RO is our current under-sink pick.

Read W

Water Filter Guru Brian Campbell · reviewer · Jan 2020

Best Under-Sink RO: Cloud RO (9.24/10).

Read V

Vocals Media admin · reviewer · Apr 2026

Yes, Cloud Water Filters is worth it.

Read I Instagram Instagram post

The build quality really stands out.

View post

3 mixed sources

F Facebook popdust

Neither is "better" at contamination removal for practical purposes. Choose based on other factors:Space & flow → Waterdrop (tankless, faster).

View post A Aqua Professor Aqua Professor · 4.7K subscribers · Jan 2026

It doesn't need electricity under the sink, but comes with a high upfront cost. And in the blue corner is the Water Drop G3P600, a tankless reverse osmosis system, which is also NSF certified. It takes up less undersink space but wastes more water than Cloud RO.

Watch A Aqua Professor Aqua Professor · 4.7K subscribers · Aug 2025

It's NSF certified for TDS reduction and SGS tested to reduce chlorine, PFAS, fluoride, and lead, but it wastes more water compared to newer tankless systems like Water Drop G3. And replacement filters cost $200 a year, which is pricey.

Watch

Frequently asked questions

It ranks #1 of 14 on our reverse osmosis systems tier list, in S tier. That placement draws on 25 cited sources across 17 outlets.

None of the 25 sources with a clear view is critical of it. Costs more than the tank workhorses. One independent reviewer has documented gaps in what Wirecutter's testing covered. Premium price. High price relative to rivals that produce the same water quality. Hefty annual filter bill on top of the purchase.