I am 11 months into my first bit of pool ownership and have just joined the board today.
My problem: like many in my parts, a warm winter and rainy spring has turned my pool green. I have been working on my own, with a pool guy, and even the dreaded pool store, but it's still green. We have shocked, shocked, shocked, floc'd, green-to-cleaned, clarified, and vacuumed. When vacuuming, though, green water shoots back out of the water returns back into the pool.
My equipment: I have a 50,000 gallon pool with Sta Rite Cartridge filters. I have replaced the cartridges within the last 4 weeks.
My water returns have periodic fine bubbles. I try to purge the air from the filter housing, but just can't seem to accomplish the steady stream of water you're supposed to get to tell you the air is out. I believe I get close but get more air into the filter housing when the pump is running. The valve just seems to stop venting air or water for a while. Then, water will dribble out a little. Next day, it seems like the air starts flowing again.
So, my idea: maybe I have an air leak into the filter housing, which then causes a bubble inside the filter, which then allows water to bypass the filter media and return to the pool still green. Today, I ordered a new housing gasket and a new set up for everything associated with the air purge valve on top. Could this be my problem and my fix?
The pool guy thinks the stuff in my pool is just too small for the cartridge filter and is suggesting I replace it with a D.E. filter, but the pool was clean until 2 months ago and had been for 15 years before that (we just bought the house with the existing pool). I don't think I got the extra small algae that has never hit the pool before and didn't hit my neighbors.
Any thoughts on getting my pool swimmable this year would be appreciated.