After last year's nightmare pool opening, (green water and 3 weeks to clear it) with a wet winter and early spring, and half the water in the neighborhood draining through our backyard and into our pool, we had a 150' curtain drain installed. It wasn't cheap, but this spring our backyard is dry, and when we removed the pool cover the water was almost clear......SWEET! The pH was 7 and the stabilizer was 40ppm. The only thing it lacked was chlorine. It was almost swimable from the get go. My son has been in 3 times this week! Thanks TFP. Ed