Cation di resins (positively charged) remove excess : sodium

10" Acid washed Coconut Carbon block 5 Micron (1) and 10" Acid washed Coconut Carbon block one Micron

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During this operation the second or third cartridge insures that the water leaving the system is of the highest purity

tubing and inline ball valve

Compact Reefkeeper Filter Pack Catalytic Carbon Upgrade ::Upgrade to Catalytic Carbon Cation di resins (positively charged)Compact Reefkeeper Filter Pack This pack includes: 1) 10 micron sediment Poly Pro 1) 5 micron Coconut carbon block 1) one micron Coconut carbon block and 1) in line DI. *Upgrading to a Catalytic Carbon stage removes on average 5 times more Chloramines than any carbon block on the market (including the ones specifically designed to "bust" chloramines). The option above adds Catalytic Carbon cartridge in place of 5 micron carbon block. For use on all