Pools are ALMOST worse than boats for the $$$$ to enjoy, actually boats cost more, to be honest. I have a 12,500 gal Vikinig Rockport pool, see http://www.flickr.com/photos/vikingpool ... 67/detail/ for some pics. Major problems I've tried to deal with are: tan staining on the white fiberglass - every 2 weeks (to correct causes major water imbalance using Absorbic Acid ... aka Vitamin C.), high CYA using Tri-chlor and Di-Chlor to re-balance. The summer of 2011 it started getting bad, 2012 it got worse, and now in 2013 on opening it was a "pretty shade of green", bad part is.. I closed using a 25,000 gal pool shutdown chemicals list of Shock, Chlorine, Metal Free, Algaecide hoping it would be crystal clear. Seems I have that horrible WWM, White Water Mold, in there now. Grief! I run the pump/filter at least 12 hrs per day during the season and generally 24/7 2 weeks before closing. I'm at a loss and hope bigger pool minds might give me a hint as to what I'm doing wrong.