I bet there is a phone call in to your yard people! Blow AWAY from the pool please!
I bet there is a phone call in to your yard people! Blow AWAY from the pool please!
I still think you're low on chlorine. You said you're CYA is 70. The chart says 28ppm during the slam process. Use the pool calculator to find out how many gallons of liquid chlorine you're going to need to get it up to say 32ppm. Then .... you have at least some buffer before you add some more. If you're at 15ppm of FC then you'll need 5 gallons of 8.25% to get you there.
The nice thing about the CYA level and needing more testing chemical is that it should be the least variable of the readings as you aren't adding anything to the pool to increase it !!
Another filtering agent that I have used is called Sparkle Up. Like DE it helps the sand filter better.
Might want to rethink that. Diatomaceous earth for pool use is sintered (heat treated).I've had DE around the house already to use in the garden, so that is what I have been adding to the filter.
Retested CY-A is still about 50-55 but FC dropped back down to 18 so in went another jug of bleach.