Hello to all,
I just closed on a new house with a large ~30K gallon plaster indoor pool that probably has not seen any maintenance or chemicals in over 18 months. Initially the water was greyish green and had the following chemistry.
FC - 0 ppm
CC- 0 ppm
CYA - 3 ppm
PH - 7.8
Hardness 312 ppm (from pool store)
Alkalinity 103 ppm (from pool store)
After doing what amounted to about a 20% water change so that a leak could be fixed; I started the shock / slam process several days ago with the pumps running 24 hours with filter backwash as required. I maintained the FC levels at 12 ppm for the first 36 hours with almost no change in water color / clarity. I increased and have maintained 16 ppm FC levels with the water color now bleaching to a light blue grey, but still with heavy cloudiness. Even with a low CYA it has been relatively easy to maintain the chlorine levels in the pool. I have noticed the CC levels starting to creep up and are now at 1.5 ppm. Using the TF-100 test kit I have the following chemistry.
FC - 18 ppm
CC - 1.5
CYA - 3 ppm
Water Temp 51f
I am thinking that the cool / cold water is slowing down the oxidation / cleanup process. I know my PH is a bit high but when I add the stabilizer it should drop my PH by 0.3 or 0.4 bringing it in to within acceptable ranges. Any ideas on how to proceed?