Quote Originally Posted by waste View Post
Chris, a fine point here, if you want to use a gallon jug for freeze protection - I recomend ~ 1/2 filling the jug with sand or gravel, to give it 'neutral boyancy'. Whether antifreeze is heavier than water, I don't know - but a floating jug does NO good for freeze protection.
I may be totally off base here, but I don't think the antifreeze is for use in the general pool water volume but rather only for putting into the pipes. Earlier in another post I made this incorrect assumption and pointed out the incredible amount of antifreeze required to keep a pool volume from freezing, until it was pointed out to me that the antifreeze is only to prevent bursting the pipes, not to prevent ice in the pool.

Richard