The TF-50 is on the way but while waiting, I thought I should ask.
Back in early March, my SWG pool showed zero FC and PH (both showed clear water) so I took the water to the pool store. Results showed:
TA = 140
CH = 600
FC = low
PH = normal (my test showed very low, clear water)
I waited for the rain and drained about 1/3 of the pool. Added CYA and Algaecide and waited for a week and brought it back to the pool store twice to test.
TA = consistently high
CH = down to 400 and then back 560 (Not sure why it came back high though water is very hard in my area, or they messed up the test)
CYA = 100
FC =low (consistent with my test)
PH = normal (again, my test showed very low)
This past Sat, I cleaned the filter and super chlorinated the pool and the next day I had good FC but still low in PH (a little pink vs. clear). 6-7 hrs later, about 7PM, my FC dropped to below normal. I have several questions:
-Why the pool store's PH test consistently showed normal vs very low in mine.
-Would the high CYA make my FC drop that quick? I know it makes the FC less efficient but am not sure if it actually lower the level. The range from the pool store show CYA to be between 60-99 (probably based on SWG pool and being sunny CA) so 100 isn't that bad, correct? I would hate to drain the pool in the middle of the drought so may be I should wait until it lower itself? I always have to add every spring.
-My TA is high, why PH is low? Because of low FC?
-Lastly, To add CYA, I put it in a net bag, dipped in the skimmer with pump running and use my hand to break them into fine powder until everything is gone. Is it an OK method to speed up the result?
Thanks for your input.