4 Stage Compact RODI System - Aquarium RO Unit with Inline DI Resin Chamber

Produce crystal-clear, zero-TDS water at home with our compact 4-stage reverse osmosis system. This plug-and-play unit is designed for aquariums, window cleaning, and domestic use, great for fishkeepers and anyone needing pure water on demand.

Sign up for a Finerfilters account to track orders, save your favourite products, and reorder in just a few clicks.

About This Compact 4-Stage RODI System

This system combines sediment and carbon pre-filtration with a reverse osmosis membrane and an inline DI resin chamber to deliver outstanding water purity. 

It removes chlorine, chloramine, heavy metals, and other impurities that can harm aquatic life or leave streaks during cleaning.

The system comes ready to install, and with all the required accessories included, such as:

●      RO tubing

●      Tubing fittings

●      Garden tap connector

●      Waste-water clamp

●      Membrane housing panner

The RODI System’s Four Stages

1. The sediment pre-filter removes sand, rust, silt, and other large particulates, protecting the downstream components.
2. The carbon block filter reduces the chlorine, chloramines, and organic chemicals in the water, improving its taste and protecting the RO membrane.
3. The RO membrane filters out dissolved solids, heavy metals, and microscopic contaminants all the way down to 0.0001 µm.
4. The inline DI resin chamber removes the remaining charged ions to produce very pure water with near-zero TDS.

At 50 GPD, the unit can produce approximately 185 litres per day, 275 litres of 75 GPD, and 370 litres a day at 100 GPD.

Why Choose Finerfilters?

We’re one of the UK’s leading names in home and aquarium filtration, trusted by thousands of customers across the UK and internationally.

Each of our kits comes complete with fittings, tubing, and connectors, including a garden tap and mains pipe adapter, so you can start producing RO water straight away. 

With filters that typically last up to six months and membranes that last 1–3 years depending on water hardness, you’ll get great long term use out of our products.

And with a UK-based support team ready to help, every order is backed by fast dispatch and a dependable service.

Order Your Compact RO System Today

If you're upgrading your aquarium setup or need spotless water for cleaning, the Finerfilters 4 Stage Compact RO System is a smart solution. Buy today with fast UK delivery. Need advice on which GPD rating to choose? Our help centre is here to support any queries.