How important is the TA and CH. Test results posted

You can adjust your TA over time, as your PH drifts up. Lowering it with muriatic acid will also lower TA.

I don’t know much about CH and plaster pools, but yours doesn’t seem terribly high.
 
I wouldn't get excited about those results. The critical ones are okay. The big question is: how does the water look? We're the only people who care about the test results. The rest of the world judges your pool by the crystal clear sparkling water that doesn't smell nor irritate skin or eyes.

If the test kit is brand new, you may have a static charge on the tip of the R-009. Wipe it before each drop with a damp paper towel for a couple days. If static is the problem, that will fix it, and your TA reading will drop without any chemical additions.

Do you have a speedstir? My CH test dropped over 100 ppm just by switching to a speedstir. It takes a huge amount of swirling to really do the CH test right. More than I was willing to do, apparently. And if that 425 CH is from testing with a speedstir, it's still not astronomical. I have no problem managing CSI until CH gets in the 800s. Don't even begin to worry about CSI until all the rest of the chemistry is old hat.
 
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