Hey
Experts, my pool test numbers are
Build Type: Plaster
Volume: 28000 gallons
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Latest Test Result Summary:
FC: 5.0 (9 minutes ago)
CC: 5.0 (9 minutes ago)
pH: 7.4 (9 minutes ago)
TA: 120 (9 minutes ago)
CH: 290 (9 minutes ago)
CYA: 10 (9 minutes ago)
TEMPERATURE: 84° (9 minutes ago)
CSI: -0.01 (9 minutes ago)
This is after a refill of 1/2 the water due to CH of about 400 and signs of scaling. I've brought the TA done from 170 by using the acid/aerate I learned on TFP in just 3 days. Will continue to do this. My pool looks amazing but the CYA is very low. The CYA is a guess as the Taylor test kit filled to the top stops at 30 and when full I can still see the dot. I added the product in the picture . 1 gallon 48 hours ago and 1 more gallon this AM . The test is about 2 hours after the second gallon. TFP math app (LOVE IT !!) says to add 2 more gallons . Should I wait a few days /hours for this product to work ? it says on the bottle it works immediately in protecting the chlorine but I would assume in order to do that the CYA would have to be present in this test . if I started with 0 cya it should take 3 gallons to get to 30. I dont want to keep dumpling chemicals in if I dont need to ..
Recap on what i have used since refill.
I've added about 2 gallons (total)of 29% muratic acid in increments of .75 gallons over 3 days at a time to lower PH and been aerating for 2 days straight with 3 large spillovers fountains for the TA. Added about 2 gallons of Liquid Chlorine over the last 3 days to slam it.
2 gallons of the Stabilizer . no other products in this water ...
thoughts?

Build Type: Plaster
Volume: 28000 gallons
------------------------------------------
Latest Test Result Summary:
FC: 5.0 (9 minutes ago)
CC: 5.0 (9 minutes ago)
pH: 7.4 (9 minutes ago)
TA: 120 (9 minutes ago)
CH: 290 (9 minutes ago)
CYA: 10 (9 minutes ago)
TEMPERATURE: 84° (9 minutes ago)
CSI: -0.01 (9 minutes ago)
This is after a refill of 1/2 the water due to CH of about 400 and signs of scaling. I've brought the TA done from 170 by using the acid/aerate I learned on TFP in just 3 days. Will continue to do this. My pool looks amazing but the CYA is very low. The CYA is a guess as the Taylor test kit filled to the top stops at 30 and when full I can still see the dot. I added the product in the picture . 1 gallon 48 hours ago and 1 more gallon this AM . The test is about 2 hours after the second gallon. TFP math app (LOVE IT !!) says to add 2 more gallons . Should I wait a few days /hours for this product to work ? it says on the bottle it works immediately in protecting the chlorine but I would assume in order to do that the CYA would have to be present in this test . if I started with 0 cya it should take 3 gallons to get to 30. I dont want to keep dumpling chemicals in if I dont need to ..
Recap on what i have used since refill.
I've added about 2 gallons (total)of 29% muratic acid in increments of .75 gallons over 3 days at a time to lower PH and been aerating for 2 days straight with 3 large spillovers fountains for the TA. Added about 2 gallons of Liquid Chlorine over the last 3 days to slam it.
2 gallons of the Stabilizer . no other products in this water ...
thoughts?