i got a 15' 42" INTEX vinyl a few weeks back. following are test numbers (tested on many days):
FC is 0 : has always measured to zero.
Ph has measured between 7.5 to 7.8
TA has been 80
TH has been 200 - 400
CYA is 30 - 50
Of all the above, FC has never changed. I have been using household bleach. The water looks good, have kept free of bugs, dirt etc.
Appreciate your advise if I should put any chemicals (always am wary of using those ).