Hello all, I'm not sure if this is normal so here is my question. I am no longer using chlorine at night, very steady. During the day, my CL goes from 10 down to .5 or 0. Any thoughts why?

Also, how long do you guys run your filter under normal conditions? Just let me know how many times water should filter and I will do the calculation based on my filter. I appreciate your time, Thank you.

Watermom, My spa is 540 gallons and has a bromine cartridge. Your point still applies. The bromine cartridge are very expensive but I guess I will stick with this system. It works pretty good but I was thinking about saving a few bucks. I've read that you can easily change from CL to BR without any issues, but cannot do BR to CL. I don't understand why, but that seems to be the consensus. So, I'm going to get the ph up to normal levels, stabilizer up to 10, then switch to the bromine. I know this is not your area of expertise but please let me know if my plan sounds plausible.