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Cloud RO
Under Sink Reverse Osmosis System
$
$649
As low as $47/mo with 
Meet Cloud RO, rated the best under-sink reverse osmosis system of 2026 by Wirecutter, Good Housekeeping, The Spruce, WaterFilterGuru, and more. Cloud removes contaminants commonly found in tap water, including PFAS, lead, fluoride, microplastics, pesticides, pharmaceuticals, and more. An integrated remineralization stage adds trace minerals like calcium, magnesium, potassium, and zinc, leaving your water clean, alkaline, and purely delicious.
Cloud connects directly to the incoming water line under your kitchen sink and delivers purified water through a dedicated drinking water faucet installed on your countertop. Unlike traditional reverse osmosis systems, Cloud features an internal hydraulic pump that maximizes water pressure, allowing you to connect the system to a refrigerator, ice maker, or even install it in a basement without pressure loss. Purified water is stored in a 2.8-gallon holding tank, so it's always ready when you are. Integrated sensors continuously monitor water quality and consumption, reporting that data directly to the Cloud app. Designed to waste less water, simplify installation, and reduce maintenance, Cloud combines advanced filtration technology with modern smart-home features. The Cloud RO system, holding tank, stainless steel faucet, filter cartridges, and battery pack are all included in your purchase. Cloud is NSF 58 certified. Click here to see NSF certification details.
Cloud is designed to fit in all standard under-sink cabinets with the system sitting in front of the tank. The provided tubes are long enough for you to arrange however fits best within your current plumbing. We are happy to provide additional tubing and fittings for basement or fridge installation.
System: 11” L x 7” W x 16”
Tank: 9” L x 9” W x 15” H
System: 11” L x 7” W x 16”
Tank: 9” L x 9” W x 15” H
You have the option to install under your sink, in your basement and even hook it up to your fridge or icemaker. Installing Cloud RO requires some basic knowledge of plumbing, but Cloud is far easier to install than traditional reverse osmosis systems.
A dedicated drinking water faucet is included with your purchase. A 0.5"-1.25" diameter hole in your countertop must be accessible to install the faucet. A sink sprayer or soap dispenser can be repurposed for the faucet, or a new hole can be drilled prior to installation.
Cloud is battery powered so no electrical hookup is required. The long lasting battery pack only needs to be replaced when replacing the filters. On average Cloud installation takes 30-60min and you can follow our straightforward video installation guide to get started. If you would like assistance with the Cloud RO installation, please find a local professional to install your Cloud water filtration system for you.
A dedicated drinking water faucet is included with your purchase. A 0.5"-1.25" diameter hole in your countertop must be accessible to install the faucet. A sink sprayer or soap dispenser can be repurposed for the faucet, or a new hole can be drilled prior to installation.
Cloud is battery powered so no electrical hookup is required. The long lasting battery pack only needs to be replaced when replacing the filters. On average Cloud installation takes 30-60min and you can follow our straightforward video installation guide to get started. If you would like assistance with the Cloud RO installation, please find a local professional to install your Cloud water filtration system for you.
Regularly replacing the filter cartridges ensures perfectly clean water every single time. Cloud RO features a user friendly filter replacement process so you can quickly and easily switch out those spent filters with new ones. Connect your device to the Cloud app and track your filter life in realtime. We will only recommend filter replacements when you need them, not on some arbitrary timeline. Cloud’s replacement logic takes both consumption and water quality into account when recommending replacements. Although Cloud’s replacement recommendations are based on your household, the typical replacement cadence for a family of four is every 9-12 months, and the cost on average is $200-$250 per year.
