An update and a thank you. It's now June 2015 and my pool is amazing, in large part due to what I continue to learn here. So, thanks for that. When we opened the pool this year the water was down and I feared a leak. I was thinking it was leaking last year but my lack of knowledge held me back. Paid a company to go in the unheated (62 degrees) water in May and they found the leak at the underwater light fixture. A common problem I discovered. I am now losing about an 1/8-inch of water per day to evaporation and occasional splash. We've had so much rain this spring I actually need to drain some water to stay below the top of the skimmers. Realized a heater was essential and had one installed a few weeks ago. Only used it a few times but it works great and I haven't even used it enough to see a blip on the gas bill. Very happy so far. This is getting long because I think new owners might learn like I did. My auto chlorinator has been empty and I'm running only on the BBB method. Very happy with that too. Numbers just yesterday after getting another 1/2 inch of rain (1/2 inch rise in the pool) were FC 6, CC 0, PH 7.7, and CYA a week ago was tested at 80, which is down from last year when I used trichlor tabs. Numbers are very stable and predictable so far so I guess I'm lucky. Chlorine drop is slow with light use. I cover most of the surface with those solar rings the previous owner left me. I've added an inflatable alligator and turtle and the ducks have not landed in it in the 3 weeks since. Water quality is great. I love my pool. Thanks again for all the helpful insight.