Ideal replacement for DI Resin, Carbon, and other media used for the water purification process. Fits standard 10" cartridge housing - Designed for upflow applications to ensure the longest possible exposure time. Twist-On Cap with Sponge to prevent filter media flow out. Instructions for refilling with DI Resin: 1) Unscrew the cartridge cap and remove the foam ring, 2) Pour the new DI resin into the cartridge and pack it down as hard as possible, 3) Tapping the cartridge on a table will help settle the resin, 4) Continue to add resin until level with the top and you are satisfied that no more resin will fit, 5) Replace the foam ring inside the screw cap and on the cap, 6) Replace the cartridge to the RO system making sure the arrow on the cartridge points up. Note: Properly filling a DI cartridge will ensure optimal performance by preventing RO water from channeling through DI Resin. Our 5lb. bag of Color Changing DI Resin will fill this empty cartridge 5 times.

• Ideal replacement for DI Resin, Carbon, and other media used for the water purification process.
• Fits standard 10" cartridge housing - Designed for upflow applications to ensure the longest possible exposure time.
• Twist-On Cap with Fine Filter insert and Sponge to prevent filter media flow out.
• Rubber gasket ensures tight fit and prevents leaks.
• Compatible with Captive Purity, Kent Marine, Seachem, Coralife, BRS, and most other residential or aquarium DI or RO/DI systems.