Questions about alkalinity and scale

[ddanderson2024]

I was on this forum a while back and purchased the FAS-DPD chlorine test and I also have the total poolcare dpd test kit : I have a 25,000 gallon plaster pool with a Pentair Quad D.E. filter system. Our pool is curvy on one side with an inground spa attached to pool or with the pool. We had a big party on 4th of July and we didn't get chemicals into it until yesterday....
Our pool looked great but still has a haze in the deep end...I made the mistake and added 5 ozs of clarifier without testing my Free chlorine ( dumb test strips said chlorine was good) so now I have tested and this is what I have
below

FC=1.4ppm
CC=.2
TC=1.6
I was going to add 3 quarts 2 cups more 10% chlorine
ph= 7.2
TA= 110 to 120 ( 11 drops it started to turn pink but when I walked away it was more grey, 1 more drop turned it red)
CYA= 34 ( we have put in stabilizer tablets )
My question is do I drop my total Alkalinity to 100? and aerate to increase my ph? or leave that for now ....
I also wanted to figure out how to measure my CSI as we do get a white ring around our pool on the tiles.

We do have alot of sunlight here in San Diego area so I am wanting to know what is a good cya number and a total alkalinity number for a plaster pool. Thank you Linda

[PoolDoc]

1. It's common to have haze after a party (or large bather load) ESPECIALLY if chlorine is low. Raise your chlorine to > 3.0 and keep it there for a couple of days.

2. There's nothing wrong with a TA of 120 . . . unless something else is going on. Do you have a heater or a SWCG?

3. Alkalinity is soluble; calcium is not. What is your calcium level?

4. CYA=34? How did you measure that? Anyhow, CYA should generally be between 30 and 90 ppm.

IMPORTANT: chlorine levels should be SET by CYA level, and should be the HIGHER of 2 ppm OR 5% of the CYA level.

5. Five oz of clarifier is not an issue . . . unless something else was added, too.

6. You are in the land of bad water. White rings MIGHT be calcium. Or they might be calcium + silica + magnesium. Do this:
+ Get some nitrile gloves or kitchen gloves.
+ Get a synthetic (non-cellulose, non-natural) sponge.
+ Make 1 - 3 cups of acid solution, using 1/4 cup of dry acid per cup of water OR 1/4 cup of muriatic acid per cup of water.
+ Saturate the sponge, and then hold it against the white ring. Notice the reaction.
+ If the ring bubbles and/or is removed . . . it's probably mostly calcium. If not, it's more likely a 'Western water mineral mess' that may have to be removed physically.



. . . but you need to know your calcium level.