Hi All! I'm new to TFP. I have a mesh safety cover over a 20x40, L shaped IG pool with a liner and live in the Northeast. Long Island to be specific. Is it true I should shock my pool at least four weeks before I plan to open? Folks also are telling me I need to add algeacide 1 week before opening. Can someone confirm if that is in fact true. I ordered one of the testing kits recommended on this site and will be testing upon receipt but was wondering if I should add water to the pool now to get it up to near skimmer level or wait until after it is opened.