Yup...same with the peristaltic pumps. You push tank water INTO the Ca reactor, and you push RODI water INTO the Kalk reactor. Surprisingly, the FW seems to be harder on the pump tubing than the SW. The SW forms a thin slime layer inside the tubing which reduces wear. I'm switching from norprene tubes to silicon tubes to see how they wear.
Right now, I have to change the peristaltic tubes every 6 months or so.
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400 gal reef. Established April, 2007. 3 Sequence Dart, RM12-4 skimmer, 2 x OM4Ways, Yellow Tang, Maroon Clown (pair), Blonde Naso Tang, Vlamingi Tang, Foxface Rabbit, Unicorn Tang, 2 Pakistani Butterflies and a few coral gobies
My Tank: http://www.canreef.com/vbulletin/showthread.php?t=28436
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