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I apologize if this is in the wrong forum but I have a couple questions regarding DE filters. First I have an 16.5k pool with a 1k spa attached this is cleaned by a Hayward Pro-Grid DE 6020. I am wondering if there are any recommendations for how long to back wash. I have the back wash...

I have a 18k pool and a 8' dia spa w/ spill way. I currently circulate the water for 10 hrs per day in the spill over mode. I have read that aerating the water will increase the ph levels which I would assume the spill over from the spa to the pool (12" drop) would qualify. It is a new pool...

I just completed an owner build pool and have some questions about why I am having such a hard time with PH & Alkalinity. The pool is a pebbletec with Salt system and a spill way spa. Pool is around 16500 gallons and spa is around 1000. I can't seem to put enough acid in to keep the ph below...