Things seem OK for now, but I’m having trouble with my adjustments. My Chlorine and pH results have been double what my target was using the Pool Calculator. My pool is 18x36. 4.5 in the shallow end and 8.5 in the deep end. Average of 6.5 says 31,500; using CAD I got 38,000 gallons. So I used 35,000.
This is a newly filled pool using city water. They generally have lots of chlorine and the tap checked 3.5. I started the pump (ejecting clouds of debris) and ran it for about 3 hours before running the 1st full test. It confirmed a basic test that the chlorine was nearly gone. The water has remained clear, but felt I should shock it. I added 415 oz of 10% Cl and 40oz of 31% Muriatic Acid for the pH. 3hours later (11PM) the FC was17.5 and pH climbed slightly. With no CYA, I had hoped to shock at 8, not 17.5.
This morning the FC was still 17, but the pH had risen to 8.2. I Added 70oz muriatic acid, and 3 lbs of CYA to “begin” stabilizing. Pool Calc suggested 12lbs. I hoped for 7.5pH, not 7.2.
I’m just wondering if these ‘missed’ targets are typical when starting up (I suspect I made a mistake in my calculations)?
Is there an order I should follow or are there higher priorities I should be concerned about?
Any suggestions on how to estimate my flow rate?
I’d appreciate any suggestions or next steps.
8PM- water clear, 67 deg
Added 415 oz of 10% Cl and 40oz of 31% Muriatic Acid
11PM- water clear
6AM- water clear, 67 deg
Added 70oz muriatic acid, and 3 lbs of CYA
11AM- water clear, 69 deg (woohoo, swimming in no time)
Basic TC off the scale >5