I have a 450 gal. Caldera spa that is 2 years old. I have maintained ph and alkalinity very well, but we do have hard water here (250ppm). Recently my ozone generator quit producing any bubbles and I discovered the Venturi was clogged with hard water scale, I assume had flaked off the heater element.
I'm thinking of dumping a gallon of muriatic acid into the full tub and circulating it overnight before draining, flushing and refilling. This should descale the entire system, right? Thoughts? I can't imagine a 1:450 ratio is strong enough to hurt anything in 8 hours?