I decided I wanted to inject "fresh" air into my skimmer. I own a HRV unit and I plumbed in 3/4ID tubing to take the frsh air from the HRV to the skimmer. It didn't make a large difference, but when 30+ people are in my house the ph drop is a little less then before. Used to go from 8.20 to 7.85 with that many people, now it only drops to 7.99!
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