We have just purchased a house with an indoor pool. The pool itself is in great condition and the equipment all runs but the water is a different story. The pool had been closed for several months before we bought it (they just did not run the pump or chlorinate it for this time). The water is cloudy but not green. It seems that the previous used trichlor tablets exclusively. All that they had used for the years before was trichlor tablets (Bio Guard), copper algicide (there were many bottles of different algicides), poly 40 algicide, and pH up. I knew I was going to have a problem right when I saw the amount of algicide as the pool gets very little sun light.
I have not done any work on the pool yet but wanted to see what is was up against so I tested the water with my new Taylor K2006 test kit. These are the results.
Temperature - 68 Deg F
FC - 5.5 ppm
CC - 0 ppm
pH - >8.0 (The test i have only goes up to 8. It took over 15 drops of the acid demand reagent to even bring it down to 7.8)
TA - 200 ppm
CH - 625 ppm
CYA - 280 ( This is an approximation as it took a 4:1 dilution before I could even fill it over the 100 mark - with the 1:1 dilution I could only fill it to half way to 100 ppm)
We intend to move into this house for 6 months then move out while it is renovated. We would like to use the pool for the 6 months then the pool will be renovated as well. I have two major concerns however. The first is with the CSI so high for the pool, is the pool and the equipment likely to be damaged. The second is with the CYA so high, what is the easiest way to get it into a safe state for 6 months. Does the pool need to be drained completely or can I get away with just draining and refiling enough to get the CYA around 50-60. Is a CYA of 50 acceptable on an indoor pool or should we really lower it to 20?
Thanks in advanced for your help (I will post pictures of the pool in the next couple of days)