White Flakes of?

[Kidneydoc]

Moved from here.

I am having same problem...Florida pool, plaster
13,000 gallon pool
SWG
CYA 70-80
TA kept around 100-120
ph 7.6
FC=6-8
CH=450

I noticed it last year when I started getting more aggressive with bicarb as I was letting the TA drop to 30-40 and thought that was too low. Now I add bicarb to get TA 100-120. Now I noticed a lot of small white dandruff like flakes in the pool....it does accumulate on floor by the water pump returns.

so sounds like I should let the TA fall back to 70 or less?

 

[mknauss]

Do you use Poolmath? You need to monitor CSI. Keeping it slightly negative, along with keeping the TA under 90 ppm, should reduce / eliminate the shedding of calcium flakes from your SWCG when the polarity reverses.

 

[Kidneydoc]

Yes. Thanks for the response.

The flakes quickly dissolved with rapid drop in PH and the TA 30-40 range.

I will start adding less bicarb each time TA is low ( I used to add 10 lb slugs when it dropped below 80 or 90). And I will let the TA get to 40 or 50 before adding bicarb.

Thanks for your help!