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FC 1.3 CC 0 PH 7.3 CYA 75 CH 245 Water is clear. Did over night test 4.5 next morning 2.0. How can water be so clear but you have something growing in it?

My metal stain keeps coming back:

I have a new fiber glass salt water pool. I installed the mesh safety cover over the pool. After about 3 weeks took it off & found discoloration to fiber glass. The chlorine level went to 18 & PH got to 8.0. Did a vitamin c test, stain went away. My readings now are: PH 7.2 FC 6 CC Less Than .5...

My Numbers FC = 7.5 CC = .5 PH = 7.8 TA = 110 CH = 250 CYA = 80 SALT = 3200 How accurate is checking CYA with inside lighting? Using K-1766 to test salt. The first trime it changes to salmon red is this the stoping point or when it stays salmon red? Adding acid weekly to keep ph down is this...

Can Valve 3 be cut on manually? Need to cut water fall on & off.

Brought CYA up from 60 to 75: FC = 5.5 CC = .5 Just A Hint of Pink (Almost Clear Before adding Drop) CYA = 70 / 75 PH =7.8 TA = 110 CH = 250 Salt = 3600 (Taylor K-1766) What is next? Lower PH to 7.2 To lower TA to 70: Then areate to bring PH back up to 7.6 / 7.8??

Her are my numbers using the TFT test kit. I have a 7000 gallon fiber glass. FC =3 CC = 1 TC = 4 TA = 100 CH = 240 CYA = 50 Salt = 3200

I have a ps4 aqua logic controller. I'm installing a hayward actuator & valve to cut my fountain on & off> Can i do this with a button or only with a time valve through the controller? I would like to cut it on & off with a push of a button>