If you decide to replace the entire filter instead of refilling it yourself with our mixed bed resin, this is your option for RNSE or RNSE+ systems. This filter is also compatible with the hydrosphere Eco Cart. This preloaded 2.5 x 20 mixed bed resin filter easily slips into your system and drops your TDS back to zero with no hassle whatsoever.

Replacement Guide

Replace when TDS creeps above 10 (Timeframe depends on frequency of use)