Professional-grade water purification for pristine aquarium water.

Waterbox RO/DI Units are engineered to deliver the purest water possible for your aquarium—ensuring the ideal foundation for reef and freshwater systems alike. Available in both 4-stage and 5-stage configurations, each system features a 100-gallon-per-day membrane and premium filtration components designed for long-lasting performance and exceptional purity.

The 4-stage unit includes a sediment cartridge, carbon block, RO membrane, and DI resin to achieve zero TDS (total dissolved solids). The 5-stage unit adds an additional DI resin cartridge for extended filter life—perfect for aquarists who produce large volumes of water or demand maximum efficiency.

How It Works:
Water first enters the sediment cartridge, which removes particulates such as dirt and debris, extending the lifespan of the following filters.
Next, the carbon block removes chlorine, chloramines, and discoloration, protecting both your aquarium and the RO membrane.
The membrane stage then removes over 98% of impurities, including heavy metals and organic compounds.
Finally, the DI resin polishes the water to absolute purity, eliminating all remaining dissolved solids. The 5-stage system doubles DI capacity for longer intervals between replacements.

Key Features:
• 100 GPD (gallons per day) membrane for high output and efficiency
• Dual inline TDS meter to monitor water quality before and after filtration
• Built-in pressure gauge for optimal performance between 60–80 PSI
• Flush kit to extend membrane life and maintain peak efficiency
• Auto shut-off system with float valve for spill-free water production

Whether you’re preparing water for mixing reef salt, performing water changes, or topping off evaporation, Waterbox RO/DI Units provide unmatched purity, reliability, and ease of use.

How to install the Waterbox Aquariums RO/DI system.