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Cation di resins (positively charged) remove excess : sodium

indicated by a blinking 'x10" image

you will also get a 1/4" tank ball valve in addition to the 3/8" ball valve

we always have over 10

Compact Reefkeeper Filter Pack Catalytic Carbon Upgrade ::Upgrade to Catalytic Carbon We are your online sourceCompact 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