PondPool
06-11-2011, 09:09 PM
I have an inground 16x36 vinyl-lined pool, 3-foot shallow end to 8-foot deep end, 25K gallons. DE filter, slow-tab chlorinator. I vacuum once a week, backwash, two gallons of shock directly into skimmer, then DE. Almost daily, green algae forms on the bottom and sides of the pool. I have tried ammonium-based algaecides which only create a soapy, greasy foam on the surface; the algae always comes back. We try to keep up with it brushing daily, but if, say, three days go by, the bottom and sides are coated with green algae. This has been going on for six to eight years. I diligently check my pH, alkalinity, FC, etc. I have heard I may need a "deep-vac" service because the algae is so settled into the liner that chemicals and simple brushing won't work; that a deep-vac, which results in about a 15% water loss because it's done with a separate pump, provides a high-powered scrubbing that cleans the liner. Has anyone heard of this, had it done, and most importantly, does it work? One service I consulted gave me a quote of $95 per hour, and it would take an hour. I wouldn't mind paying this if I knew it would work! Thank you.