200 GPD RODI Filter

Produce crystal-clear, zero-TDS water fast with this high-output 200 GPD RODI system. Designed for reef keepers who demand purity, it removes chlorine, chloramines, heavy metals, silicates, nitrates, and other contaminants that fuel algae and stress corals. Perfect for mixing saltwater and topping off after tank evaporation.

What's in each stage

Stage 1 – PP Sediment Filter: polypropylene prefilter catches sand, silt, and rust before they can clog the rest of the system, extending the life of every stage downstream.

Stage 2 – CTO Carbon Block: activated carbon strips chlorine, chloramines, and organic compounds from your tap water — the stuff that destroys RO membranes and fuels algae blooms.

Stages 3 & 4 – Dual 100 GPD RO Membranes: two high-rejection reverse osmosis membranes working in a water-saver configuration. Together they produce up to 200 gallons per day while sending less water down the drain than a single-membrane unit.

Stage 5 – Mixed-Bed DI Resin: the final polish. Color-changing DI resin grabs the last remaining ions so your TDS meter reads a true zero.

Ready to run out of the box

Ships preassembled with shutoff and flush valves installed — no plumbing puzzle on arrival. The flush valve lets you rinse the membranes before each run for longer membrane life, and the shutoff valve stops flow instantly when your reservoir is full.

Why make your own water?

Store-bought “purified” water is inconsistent, and hauling jugs gets old fast. A home RODI system pays for itself in months and gives you complete control over the single most important ingredient in your reef tank.

0 TDS guarantee: if your unit doesn't read zero TDS out of the box, send it back for a full refund.