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.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.
Sorry that I've been away from here for weeks but life gets in the way sometimes.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.
We covered that ground earlier in this message thread. I deep cleansed the filter when I opened this season and again a few weeks later with no change.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.