Eliminator® 4 Manual Flush Aquarium RO/DI System — 90/150 GPD
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- Founded 1985
- Built in Tempe AZ
- In-house membranes
- Lifetime support
The Eliminator 4 RO/DI is our aquarium-focused 4-stage RO/DI system with a manual flush valve to extend membrane life. Single SpectraPure membrane in 90 or 150 GPD, followed by a custom-formulated mixed-bed DI cartridge for 0 TDS output. Built and tested in Tempe, AZ — no pet-store padding, just the gear that keeps reef tanks alive.
Features
- SpectraPure 90 GPD or 150 GPD RO membrane — 98% stabilized rejection
- 1 micron sediment pre-filter
- 1 micron carbon block pre-filter
- SpectraPure custom-formulated mixed-bed DI cartridge for sustained 0 TDS
- Manual flush valve extends membrane life and prevents TDS creep
- Automatic inline shut-off valve for unattended production
- Float valve for reservoir-based production
- 3 clear filter housings
- HM Digital DM-1 TDS meter for continuous monitoring
- Pressure gauge, no-rust mounting bracket, housing wrench, garden hose adapter
Specs
- Production: 90 or 150 GPD at standard conditions
- Waste ratio: 3:1 on hard water, 2:1 on soft water
- Stages: sediment → carbon → RO membrane → mixed-bed DI
- Tubing: 6 ft feed, 6 ft product, 6 ft waste
- Warranty: 1 year
Related products
- Higher capacity dual-DI: Eliminator 6 RO/DI 300 GPD
- Upgrade to 1:1 waste ratio: MaxCap 1:1 UHE 100 GPD · 200 GPD
- Pre-treat chloramines: Eliminator Dechlor 2-Stage Pre-Filter
- Browse all aquarium RO 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.
Note: DI water is not intended for drinking. DI resin is not made from food-grade material.
Replacements & compatible parts
Cartridges, membranes, and parts that fit this system.