RODI
Reverse Osmosis + DeionizationWhat does RODI mean?
RODI (Reverse Osmosis + Deionization) is a multi-stage water filtration process that produces ultra-pure water (0 TDS) for reef + planted aquarium use. Tap water contains chloramines, phosphates, copper, and other contaminants harmful to aquatic life; RODI strips them.
How is RODI used in aquariums?
A typical 4-stage RODI unit: sediment filter → carbon block → RO membrane → DI resin. Test output with a TDS meter: 0 ppm = clean. RO membranes last 2-3 years; DI resin lasts 6-12 months depending on source water quality.
How RODI fits the bigger picture
Understanding RODI matters because it's connected to broader husbandry decisions: equipment selection compounds: skimper + return + dosing all need to match each other and the tank size.
Browse the Fast Aquatics care library for full husbandry tutorials covering RODI in context.
Frequently asked questions
What does RODI mean in fishkeeping?
RODI (Reverse Osmosis + Deionization) is a multi-stage water filtration process that produces ultra-pure water (0 TDS) for reef + planted aquarium use. Tap water contains chloramines, phosphates, copper, and other contaminants harmful to aquatic life; RODI strips them. A typical 4-stage RODI unit: sediment filter → carbon block → RO membrane → DI resin. Test output with a TDS meter: 0 ppm = clean.