This is my third season as a pool owner. Last two seasons i seemed to be doing ok with the chlorine levels.
This year my Combined chlorine reading and Free chlorine reading both frequently read low.
I have been reading the pool school FAQs and this is my suggested action plan. just wanted someone's expert opinion before i dump a lot of dichlor into the pool.
I dont want to increase the CYA to a too high level by making a mistake.
I have a mesh cover and I had a lot of debris from leaves at the beginning of the season. The water was cloudy for a long time. Pool store told me i had 100ppm phosphates. I kept shocking the pool and it has cleared up now, but the chlorine readings are still both low. I have only been adding 3-4 lb's at a time.
I turned up the setting on my off-line chlorinator and dumped a lot of thrichlor pucks in it. Still the chlorine readings wouldn't come up.
Now my CYA has increased, it was 30 ppm before now it looks like 60 ppm.
My understanding in where i went wrong is i didn't add enough dichlor to perform superchlorination, i was just adding to the combined chlorine, process never got completed. In order to increase the FC i have to add more dichlor. According to the pool calculator i should add 7lb's 13 oz to achieve a shock level of 20 for FC. Now if i understand correctly as the CYA increases so does the shock FC.
Does the 7lb 13 oz sound correct?
I have a 26500 gallon pool
CC is 1ppm
FC is 0.5ppm
pH is 7.6
Alkalinity is 120 ppm.
Hardness is 150ppm
CYA is 60ppm