I would like to use the household soft water to maintain my water level after I have achieved the desired CH for a pebble-tech pool. Are there any water chemistry (not price) advantages to using KCl instead of NaCl in the softener? I tried it a few years back, and stopped when the chrome ring around my light turned black. It cleaned up fine, but it scared me from continuing to use soft water with the leveler. I can't remember if I used KCl or NaCl at that time (I have used both).