The question of aquadoors and skimmers / Gizzmos etc, has come up a couple of times today and there's something I haven't seen addressed yet. When you cover a pool with a solid cover, any rain, snow or ice on the cover raises the pool water level. If you have an open skimmer, the water will enter when it gets high enough, if you drain the pool far enough below the skimmer and are diligent about removing water from the cover, you can have a dry skimmer all winter, if not ...
Of course, mesh covers allow water to p*** through so the skimmer will fill if no aquadoor is in place.
I've noticed that the people responding to the 2 threads are talking about IGPs and AGPs yet we're not specifying which kind is being talked about (I realise that some people have specified), which may be part of the confusion, I base most of my comments on IGPs, esp when the type of pool isn't specified - maybe we should all add afew more words to our posts defining which type we're addressing - at least for the closings, the two close quite differently and what applies to one is totally wrong for the other.