I am a lead lifeguard at a pool I work at and I am having problems with our hot tub. We are adding in lots of calcium chloride to raise the calcium hardness and it is not doing anything. Our target is to get the CH up to 600 ppm and we have only been able to get it up to a 150 at most. We added 700 lbs. of CC to the spa throughout the month of April and it consistently drops. The spa chemicals other than that are pretty stable.
The spa is an indoor spa that autofills; vinyl lined. The spa holds 3,675 gallons of water.
Does anyone have an idea of what the issue might be? I would be very grateful.