Currently I use Baquicil for my pool and have for several years with no problems to speak of until last year and this year. Last year I got pink slime in the pool and that is a big pain to take care of. This year we put in a new liner, new sand, of course new water and It probable took about a month and there was the pink slime again. Everything was clean at the start including all the lines. I don't know why in all the years I've done the same thing I now have this problem. I am thinking seriously about going to something other than Baquicil (its so darn expensive) maybe chlorine. If someone has a system or products they really like and works really good I would love to hear about it. I live in a very hot climate in the summer, Redding Ca but I do have the pool under shade cloth and its not used in the winter. Any advice or thoughts would be greatly appreciated.