4-Stage Under-Sink RO Drinking Water System — 90 GPD
SKU 45-0023Or 4 interest-free payments — see options at checkout.
- Founded 1985
- Built in Tempe AZ
- In-house membranes
- Lifetime support
Our standard under-sink drinking water system. 4 stages of filtration, a SpectraPure 90 GPD RO membrane, and a 4-gallon pressurized tank for on-demand flow at the faucet. Easy install, NSF-grade components, and an annual cartridge swap keeps it running for years.
Features
- SpectraPure 90 GPD RO membrane for excellent rejection
- 0.5 micron sediment pre-filter — high dirt-holding capacity
- 0.5 micron carbon block pre-filter — removes trihalomethanes, chloramine, pesticides, volatile chemicals, and 99.95% of giardia/cryptosporidium
- 60 cu in OCB granular activated carbon post-filter polishes taste before the faucet
- Auto shut-off (ASO) valve preserves membrane life when the tank is full
- 4-gallon pressurized storage tank with ball valve
- Long-reach, lead-free non-air-gap faucet
- Pressure gauge for system monitoring
- Double O-ring housings for a leak-tight seal
Specs
- Production: 90 GPD at 60 psi, 77 °F
- Stages: sediment → carbon block → RO membrane → GAC post-filter
- Tank: 4-gallon pressurized
- Faucet: long-reach non-air-gap, lead-free
- Included: feed adapter with valve, drain saddle, quick-connect fittings, tubing, filter wrench
- Warranty: 1 year
Related products
- Replacement cartridges: Drinking Water System Cartridge Replacement Kit
- Add a permeate pump: DWS 90 GPD with Permeate Pump
- Compact version: MaxPure 90 GPD Drinking Water System
- Browse all drinking water systems
Questions about filters, production rates, or membranes? Visit our Know Your Filters page or contact us.
Cleaner water for plants, pets, and people
Reverse osmosis membranes reject microplastics, PFAS and "forever chemicals," chlorine and chloramine byproducts, heavy metals, and the dissolved solids that show up as taste and scale. That means cleaner feed water for your plants, animals, business, or family — and a lot less reliance on bottled water, which keeps plastic out of the landfill. Most setups run a 3:1 waste-to-product ratio on hard water and 2:1 on soft water, and can be tuned to 1:1 in high-purity feed areas or with a periodic pure-water flush. The system is built to last with field-serviceable filter housings, so you replace cartridges (not whole units) for years of dependable purity.