Grand kids have been in the pool since mid morning.I checked chlorine at 730 p.m.,just as soon as they got out. Just done my chlorine test twice and got 6.5 and 7.0 cc 0.0...My usual reading is 8.0 with cc 0.0....
Can I figure this is a normal drop since the pool has been full of kids most of the day??
Other numbers are: (from saturday)