I am a Pool owner and a Real Estate Broker in California, Hawaii and Nevada. My primary residence with the 10year old, 30,000 Gallon pool, is in the SF Bay Area. I have horrible Algae problems hat no one can ever seem to solve! I've had 4-5 pool maintenance companies quit because they cant figure it out CrAzY huh? I have a new (1yearold) Filter w/4 large cartridge's, a chlorinator & 3hp Variable speed pump. I clean the filters, baskets, brush it, twice a week, bring water to be tested at Leslies every week and every thing else possible do to maintain it. I STILL have bad green algae problems.(That my neighbors with pools dont experience) Its a nightmare. This is the last year I will try to maintain it, if not, I need to call it a $80K mistake and fill it full of dirt. Pool contractors have no idea either after pressure, leak, xray and every other test you can imagine.