The AquaFX Add-On DI Dual Canister is a powerful final filtration stage designed to produce ultra-pure, 18 megohm water for your saltwater aquarium. This unit can be easily integrated with most existing Reverse Osmosis systems or used as a standalone deionization polisher. By removing the final traces of total dissolved solids (TDS), it ensures the highest quality water, effectively preventing nuisance algae and protecting sensitive marine life from contaminants found in tap water.

This system includes two 20x2 inch refillable clear canisters, allowing you to easily monitor the resin's condition. It comes pre-filled with nuclear-grade, virgin, color-indicating deionization resin, which changes color as it becomes exhausted, signaling time for a replacement. Hobbyists can choose between a configuration of two mixed-bed DI cartridges or a specialized setup of one anion and one cation cartridge for targeted ion removal. The package is complete with a sturdy mounting bracket and four feet of tubing for a quick and straightforward installation.

This add-on DI unit is ideal for the dedicated reef aquarist who already owns an RO system and seeks to achieve the absolute purest water possible for their tank. It's also perfect for hobbyists in areas with high TDS tap water who need extra deionization capacity. By producing zero TDS water, this system provides the clean slate necessary for maintaining stable water chemistry and creating the pristine environment required for delicate corals and invertebrates to thrive.