This Hydrologic De-Ionization Cartridge is built to purify RO water by eliminating total dissolved solids, such as nitrates, heavy metals, etc. It fits perfectly into RO filter housings that accept 10 * 4.5 cartridges. 

The resin changes color when it's time to replace. It is very easy to use and has translucent housing. Improve the water quality today in your home with Hydrologic De-Ionization Cartridge.

Specifications: 

• SKU/Model No.: HF-HL22017

• Brand: Hydrologic

• Size: 10" X 4.5"

• Weight: 2.5 lbs