Any help is appreciated as I’m at my wits end. We have a roughly 6 month old gunite pool. I’ll list all my parameters below, but my issue is CH. It was all the way up to 775 so I decided to go ahead and do a partial drain and refill with our tap water that consistently tests right at 300. I drained about 60-70% and according to the TFP calculator that should’ve brought it down to less than 500. I finished the refill yesterday morning, ran the pool, added 120lbs of salt, and then tested today. After all that my CH level dropped from 775 to 675. How did I only lower it 100ppm? Where is the calcium coming from if it’s not already in my tap water? I’m confused, frustrated, and a little angry right now since I just ran my water bill up about 6000 gallons for basically no reason. Can someone help me understand what the heck is going on here?
~9000 gallon gunite saltwater pool,
tested w/TF-100
Levels on 11/15
FC-4
CC -0.5
CYA - 60
CH-775
TA - 110
Tap water CH 300
CH level on 11/21 675
~9000 gallon gunite saltwater pool,
tested w/TF-100
Levels on 11/15
FC-4
CC -0.5
CYA - 60
CH-775
TA - 110
Tap water CH 300
CH level on 11/21 675