Eliminator® 4 Hydroponics RO System — 90/150/300 GPD
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- Founded 1985
- Built in Tempe AZ
- In-house membranes
- Lifetime support
The Eliminator 4 RO Basic is our 4-stage hydroponics RO system. Available in 90, 150, or 300 GPD configurations, it hooks up to any hose-bib or sink faucet (with adapter) and produces pure water on demand — no reservoir, no float valves, no complicated plumbing. Fill jugs, watering cans, or run direct to your setup.
Need automated production with float-valve control? Check out the Eliminator 4 RO Float Ready version.
Features
- SpectraPure 90 GPD, 150 GPD, or dual 150 GPD membranes — 98% stabilized rejection
- 1 micron sediment pre-filter
- Dual 1 micron carbon block pre-filters
- 3 clear filter housings — quick visual check on cartridge condition
- HM Digital DM-1 TDS meter for continuous water quality monitoring
- Pressure gauge for pre-filter monitoring
- Durable no-rust mounting bracket
- Housing wrench, garden hose adapter, 6 ft feed/product/waste tubing all included
Specs
- Production: 90, 150, or 300 GPD (dual 150 GPD membranes) at standard conditions
- Waste ratio: 3:1 on hard water, 2:1 on soft water
- Stages: sediment → dual carbon → RO membrane(s)
- Tubing: 6 ft black feed, 6 ft blue product, 6 ft yellow waste
- Warranty: 1 year
Related products
- Automated/float-ready version: Eliminator 4+ Auto Shut-Off Hydroponics RO
- Step up to RO/DI for aquarium use: Eliminator 4 RO/DI 90/150 GPD · Eliminator 6 RO/DI 300 GPD
- Pre-treat chloramines: Eliminator Dechlor 2-Stage Pre-Filter
- Boost low pressure: Eliminator Booster Pump Kit
- Browse all 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.