Thanks for the advice.

I need to add more CL tonight. It dropped again. My pH is holding at 7.5. The ALK is climbing - 100 to last night's 90, but the CAL dropped from 140 to 130.

I've tried to glean "optimal" values from the forum and think I have them. Could someone let me know if I'm about right for using the BBB method?

"Optimal" values for vinyl liners
FC - 1-3ppm
pH 7.2-7.6
ALK - 80-120
Cal - 200-350
CYA - 30-60

I would like to turn the heater on for a while once I get things settled. It's a tad chilly in there. I'm afraid if I do it now, that green/brown stuff will "cook" onto the sides.

At what point in the chemistry can I safely let the kids in?

CoffeeBean