An inline mixed-bed deionization (DI) filter for ultra-pure, near-zero-TDS water — packed with DuPont AmberLite MB20 resin. Ideal for aquariums, RO polishing, brewing, and hydroponics. Fits 1/4″ and 3/8″ tubing.

What it does

This inline DI (deionization) filter is engineered for TDS removal to deliver ultra-pure, near-zero-TDS water. It uses ion-exchange resin to capture the dissolved ionic contaminants that remain after reverse osmosis, producing the purest water in the lineup.

Packed with premium DuPont AmberLite MB20 mixed-bed ion-exchange resin. Commonly installed after the RO membrane and before a carbon polishing stage. Popular for aquariums (fresh & saltwater), breweries, labs, and hydroponics. Cold water only.

Key benefits

• ✓Ultra-pure / near-zero-TDS output — the purest stage in the lineup
• ✓DuPont AmberLite MB20 mixed-bed resin
• ✓Ideal for aquariums, brewing, hydroponics & labs
• ✓Removes dissolved ionic contaminants after RO
• ✓Fits 1/4″ & 3/8″ tubing
• ✓Quick-connect design for fast setup

Helps reduce

Specifications

Installation & connection

• Install after the RO membrane — typically before the final carbon polishing stage.
• DI resin exhausts based on incoming TDS — lower feed TDS means much longer life. Feeding it RO water (already low TDS) maximizes lifespan.
• Select your tubing size; adapters are included.
• Cold water only.
• Replace when TDS output rises above zero (a TDS meter tells you when it’s spent).

Often used with