CarlD
I understand about not useing the cover. CO2 has to be able to out gas. I have a blue one but have been to lazy to put it back on. I am gonna build a reel for it next year. I am also looking at building solar heating racks. Just put in a house before the pool so I am going on way too many projects both in time and $$$. I guess I might give the alk drop a whirl sooner than planned. I told the future wife about the salt ideal and you know how it goes. Btw seen your pool the other post very nice.

Thanks again
Steve