Quote Originally Posted by CarlD
I'm afraid SJohnson has missed the obvious reason for your high chlorine demand. It's SO obvious that it's smacking me in the face.
Mmmm, I'm not so sure. He doesn't report an algae problem, so I'm thinking the trouble is keeping Cl up high enough to keep the pool sanitary, not keeping algae down.

A 90 degree pool + lots of sun + lots of people = lots of cl demand. I think a SWC will be able to do it, but i'm thinking your pump run time may need to be adjusted to 8 hrs, to give enough time to turn the pool over properly and also give time to make Cl.

Michael