Hi all. I'm new here but I've done tons of reading. I am dealing with my first pool in a house i purchased last month. It is an outdoor diving pool calculated at about 15,000 gallons. I have a new tf100 test kit and I've been following the instructions precisely when testing.
My alkalinity has been a bit high between 120 and 140ppm. My PH keeps increasing and the pool is not being used. The water temp has been around 60 to 65 Fahrenheit. CYA is at 30ppm. I've been using only 10% liquid chlorine as a sanitizer so i do not raise the cya too much. The pool was resurfaced 3 months ago with pebble tec which I've read can affect ph and alkalinity for at least a few months.
Here's what I've done and where i started in regards to ph and alkalinity.
On 3/13, alkalinity was 130ppm and ph 8.0. I used the pool calculator and added 41oz of 14.5% muriatic acid. Later that day, i retested and PH was 7.8 and alkalinity 120ppm. I added another 16oz of acid. Several hours later, i was at 7.6 PH but still 120ppm alkalinity.
Yesterday, 3/16, i tested alkalinity at 140ppm and ph at 7.8. I added 41oz of acid again which brought it down to 130ppm alkalinity and 7.6 PH.
Today, 3/17 alkalinity was 130ppm and 7.6 ph. Per the calculator, i added 72oz of acid again and brought the ph down to 7.3 with the intent to aerate and bring it back up. The problem is that even after 72 ounces of acid, the alkalinity only went down to 120ppm.
If i keep adding acid to reduce alkalinity, won't my ph drop too low? How can i decrease alkalinity without decreasing ph too much at the same time?
Thanks for any help!
My alkalinity has been a bit high between 120 and 140ppm. My PH keeps increasing and the pool is not being used. The water temp has been around 60 to 65 Fahrenheit. CYA is at 30ppm. I've been using only 10% liquid chlorine as a sanitizer so i do not raise the cya too much. The pool was resurfaced 3 months ago with pebble tec which I've read can affect ph and alkalinity for at least a few months.
Here's what I've done and where i started in regards to ph and alkalinity.
On 3/13, alkalinity was 130ppm and ph 8.0. I used the pool calculator and added 41oz of 14.5% muriatic acid. Later that day, i retested and PH was 7.8 and alkalinity 120ppm. I added another 16oz of acid. Several hours later, i was at 7.6 PH but still 120ppm alkalinity.
Yesterday, 3/16, i tested alkalinity at 140ppm and ph at 7.8. I added 41oz of acid again which brought it down to 130ppm alkalinity and 7.6 PH.
Today, 3/17 alkalinity was 130ppm and 7.6 ph. Per the calculator, i added 72oz of acid again and brought the ph down to 7.3 with the intent to aerate and bring it back up. The problem is that even after 72 ounces of acid, the alkalinity only went down to 120ppm.
If i keep adding acid to reduce alkalinity, won't my ph drop too low? How can i decrease alkalinity without decreasing ph too much at the same time?
Thanks for any help!