I use the PO4, Ca, and Alk checkers and like them all. I've read some people have difficulty with the CA checker but I've never experienced any issues.
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Mike
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ReefKeeping.com TOTM Nov 2012
Socalireefs Featured Reef Oct 2011
Current Tank Info: 60*30*20, 8x54 ATI Powermodule, ReefBrite XHO, ATB Elegance 200, Aquamaxx CTech CaRx, Ecotech Vortechs, Apex Controls, WM Ecobak powered. RedSea Reefer 170, MP10, Apex Jr, Ecotech Radion XR15, Aquamaxx WS-1
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