I have no reason to believe that nitrates got into the pool other than potential overspray of a spreader for the guys that fertilize my lawn. I have never seen any dry fertilizer on my pool deck. The guy in the store ran the nitrate test and told me the nmber was "15"
In any event, the numbers are:
fc 0.0
tc 0.3
ph 7.7
hardness 240
alk 80
cya 50
I chlorinate with an automatic chlorinator and have it open all the way. I know its working in that i just cleaned it about one month ago and the tablets are dissolving in due course. For some reason, despite the fact that the chlorine tablets are dissolving and I fill up about twice per week, i cann't get the fc level up. Is it possible that the algea is using the chlorine? Also, I've put a lot of algecide in over th past month. Could this have an affect?