I am also having an issue with chlorine. Last year we could not keep the chlorine level high enough to show up on a test. The CYA levels were fine. This year we drained some of the water but still cannot get a chlorine reading to last more than a couple hours. What do you suggest?
Finally got my test kit. Result from yesterday are:
FC 7 (after adding 2gal bleach)
This morning the readings were:
The water is crystal clear and there is no algae. Do we need to keep the chlorine level at 6 as stated in the chart for it to be safe to swim in?