Costco Reverse Osmosis Systems

Costco sells several under-sink reverse osmosis systems, including the Pure Blue 1:1, the Delta Clarifi tankless 6-stage starter kit, the Aquverse 5-stage and the Brondell Circle. Compare certification, flow, waste ratio and filter costs.

What to compare

Tank vs tankless: tankless systems save space and flow on demand but need an outlet.
Waste ratio: the Pure Blue 1:1 is named for its claimed 1:1 ratio. Check each model's data sheet.
Certification: NSF/ANSI 58 listing and the contaminants covered, such as lead or PFOA/PFOS.
Filter costs: Costco sells some replacement sets, such as Pure Blue's 5-piece pack. Confirm fit with your model.
Warehouse-only: some kits, like the Delta Clarifi, may be in warehouses but not online.
Faucet finish and installation hardware.

Compare with Tankless Reverse Osmosis Systems and Waterdrop Reverse Osmosis Systems, and spares in Costco Water Filter Replacements.

FAQs

What reverse osmosis system does Costco sell?

Costco's lineup has included the Pure Blue H2O 1:1 system, the Delta Clarifi tankless 6-stage starter kit, the Aquverse 5-stage RO system and the Brondell Circle, with differences between online and warehouse availability. Check current listings, since models and prices change frequently.

Costco RO vs Waterdrop G3P600: which is better?

Compare certifications, flow and waste ratio, and filter costs. The Waterdrop G3P600 is a 600 GPD tankless system with a smart faucet. Costco's tankless options compete directly, while tank systems like the Pure Blue 1:1 deliver steady flow without power. Choose based on space, power and ongoing filter cost.