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Peachy,Are you using some form of pH balancing chem?
I suggest you get your water tested by a professional. Typically if calcium is coming out of solution, it is from high pH.We sell Freshwater Stain and Scale Defense. Add 2 oz. per 500 gallons at start up and weekly. I'm sure it wouldn't hurt to use your metal product weekly.I would be concerned that if you had a calcium build up on the heater you might also have a build up in the circ pump.
My dealer recomends using Defender every other week to help prevent calcium build up. GeorgiaPeach, do you use Defender or a similliar product?
My fuzzy memory tells me that pH perfect and other such products pull calcium out of solution and they are not recomended for spas with circ pumps. Have your dealer check with Hot Spring. If you cannot get an answer let me know and I can follow up. Yes, I am suggesting get a sample of your spa water tested by a pool/spa pro.
Hey Chas,When I do a drain/refill, I put a bottle of perfect PH, Any suggestions would be greatly appreciated! Peachy