TA, CH & CYA Numbers Dropping

[mjbarr99]

Hello All. I'm a newbie and noticed my numbers for TA, CH, and CYA have dropped since I tested 3 days ago. My pool is brand new, so is this normal during the plaster curing process? My numbers when I tested on 5/22 were:

TA - 130
CH - 350
CYA - 40

My numbers this morning:

TA - 110
CH - 175
CYA - 20

My CC was 1.5 on 5/22 so I have been adding liquid chlorine to keep my FC around 9. This morning my FC is 9 and my CC is 0.5. The water has been clear and my pH has been between 7.4-7.5.

 

[Mr Bruce]

Have you had a massive (50%) water exchange?

 

[mjbarr99]

Have you had a massive (50%) water exchange?

Nope. Not sure if it's a pool issue or my testing methods. I don't want to start adding chemicals until I know for sure.

 

[RobbieH]

Do you have an auto-fill?

 

[Mr Bruce]

CH I could see if you did a 25ml sample one time and a 10 ml the next. CYA is hard to mess up quantities.

The one that alarms me the most is CH, if you just had new plaster. I would do that one again with someone else, read the card out loud and verify each step.

 

[YippeeSkippy]

Do you have an auto-fill?

Yeah, that was my first thought too. If the pool had an occult leak that wasn't detected because of the autofill.

Would you hear the water coming on and off though?

 

[RobbieH]

Yeah, that was my first thought too. If the pool had an occult leak that wasn't detected because of the autofill.

Would you hear the water coming on and off though?

You could not hear mine. But you can't hear any of my equipment at the pool.

 

[mjbarr99]

Do you have an auto-fill?

No, but I did add some water yesterday to get me half way up the waterline tiles. The water was approx 1/4 above the tiles before doing so. My PB came over yesterday to check out the equipment and told me to add water.