Collection: RO Filters

Start With Water That Has Nothing in It

Tap water carries chlorine or chloramine, and depending on the supply it can also bring phosphate, silicate and nitrate along with it. All of that either feeds algae or shifts parameters you then spend money correcting. An RO or RO/DI unit deals with the problem at the source instead of in the display.

Choosing a System

• Three-stage RO — sediment, carbon and membrane, producing RO water.
• RO/DI systems — the same stages plus a deionisation cartridge, taking output closer to zero TDS.
• Four-stage RO/DI — larger housings with a separate DI stage, for higher throughput.
• Output ratings — 50, 100 and 200 GPD, quoted at the manufacturer's test conditions.

Treat GPD ratings as a ceiling, not a promise. Those numbers assume a given feed pressure and water temperature, and cold water or low household pressure will both pull real output well below the figure on the box — which is why a booster pump is a common addition on well systems and cold-climate installs. Whichever unit you pick, buy a TDS meter alongside it: there is no way to tell by eye when a DI stage has stopped working. Questions? Email info@jlaquatics.com.