I have owned a pool for about a year. I always just had the 3inch tabs in the chlorinater and added liquid chlorine here and there. My pool would never turn green and I don't think it gets very dirty. There are few trees about, it is caged and it is surrounded by landscaping stones past the pavement. However, I went away for three months and the person caring for the pool did a poor job and it was green.
I went to Walmart and bought "Pool Essentials Shock" which is 1lb bags of what says 53.8% Trichloro-s-triazinetrione and it says 48% available chlorine.
After reading this website I now know that trichlor is to be avoided because it raises the CYA too high.
When using the calculator, do you account for the "53.8%?", if you put one bag, is it 16x.538=8.6 ounces of Trichlor or is it just 16 ounces?
My plan tomorrow is to go to the pool store and get a free pool test although I imagine the CYA will be very high and I will need to drain some water and add some more. I have read on here how unreliable the pool store tests can be. I also believe that my PH may be low from my reading here. What steps do I need to take and in which order to deal with the effects of high CYA and low PH? I do not want to trust the pool store.