a more wide angle view of the set-up...left front is the chiller, center is the Co2 tank, with the Ca reactor just behind it to the right, and down to the left is the circ. pump, an Iwaki 70 RLT..to the right is the skimmer. Directly above the Ca reactor is the return from the tank, with it's multitude of break-offs! Somewhat snake-like, it certainly does the trick. Oh, BTW, Flexspa is the BEST! In the left background, 2-55 gal. food grade containers, one RODI, one salt H2O. I have it set-up so that water changes are done with NO lifting at all! (Thanks to Bec for some GREAT ideas!)