I had no loss at all for three and a half hours this afternoon. It'll be fun to see how the OCLT goes tonight.
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It sure sounds like your close! I dont think a loss of 4 ppm from direct sunlight would be unusual.
It's clear that changing the sand made a big improvement which makes me ask why didn't back-washing work to clean up the old sand? I even stuck the garden hose in the sand and flushed it good.
Mike, What does that translate into on how much 12% you are adding now? And when do you add it and do you test it a couple of hours after to make sure you're at the correct level? I ask so maybe I can get a better idea of what I am adding.
Hi Mike, I've been following along as I also struggle to maintain control ast the season starts up. We have pollen in drifts, and farm fields all around, so I'm always a bit sensitive to high pollen load or even airborne fertilizer contamination (ammonia). But it's always fine - my Cl levels go a bit up and a bit down - about a 2-3 point swing over a week. Some of your tests were mind-boggling in comparison.
I picked up on this comment you made on cleaning your filter.
Are you aware that backwashing your filter is not the same as a deep clean? And that you really should let your filter get a bit dirty to catch stuff - definitly wait until your pressure rises over 25% above clean.
But nothing can substitute for a deep clean - where you gently push your hose down below the laterals and systematically flush out the funk. I spend 30-40 minutes on this at season end. Just when you think there's not much left - like 15 minutes in - you realize, oh yeah! There's more! I tried to find a pool school article to point to, but I didn't see one - search the forum and you'll get some good pictures or links to videos.
Sounds like you're doing much better now, but when you close up I highly recommend a filter deep clean.