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You shouldnt need to replace your water to help with your TA and PH. Put muriatic acid in to lower the pH, which you should do pretty soon, your pH is very high. It will also drop the TA down a little. You can continue to use muriatic acid to drop pH and TA, then aerate to bring the pH...

Yellow stuff at the bottom can definitely be pollen, as mine was pollen.

I have nothing to add to this thread other than noting that: is awesome.

You need chlorine, and a lot of it. Based on your CYA level (which is pretty high) you need to bring your FC up to 25ppm and hold it there for a couple of days (until it doesnt drop overnight). Based on your numbers/pool size, you need to put in the neighborhood of 4 gallons of bleach in to...

The fact that your chlorine keeps going to zero means that something is using it up. You need to do like everyone else said and get some test numbers asap so you can know how much chlorine you need to add to get it to shock level.