Richard,

Thanks for the encouragement. Once I decided to go with the theory that this was algae, I really thought I'd be cleared up by now. Dump in a bunch of bleach, filter on 24/7 and wait 24-48 hours and - presto! - a clear pool, right?

The odd thing is that I truly thought my CL levels were on the high side prior to this. I guess a lot of organics can overwhelm even a relatively high CL.

Also had another thought on how this happened - a hose. We used a couple of hoses strung together to siphon out our pool during construction when it was pretty grungy and we were hosts to a number of toads (we relocated them prior to draining). We were also concerned about mosquitos breeding in the standing water. I don't remember exactly which hose was used for discharge of the grungy water, but I know certain hoses we use a lot, were not. Normally, those known-clean hoses are the hoses I use to top off the pool.

Just 3-4 days prior to the first white-ish haze, we cleaned the filter and I had to connect 2 hoses to reach the area. If the second hose I connected happened to be a previous discharge hose, well, then I could have introduced heaven-only-knows-what directly into my filter . That combined with the organic overload might have triggered this whole thing.

I'll be trashing all suspect hoses.