What is scale and how do I remove it?

Scale is caused when calcium levels are too high and the calcium mineral has precipitated out of the water and attached to the plumbing or shell. It will often appear as white flakes or a sandpaper feel on the walls of the spa. The solution is to use a scale remover. Pool Stain Treat is great for removing stains and scale, and can keep it from coming back with regular usage. Lowering the pH during the cleaning process will help to remove the scale, but remember to raise the pH back into range before using your spa. If you have high calcium in your source water, you will want to filter out some of the calcium and / or use a calcium reducing or sequestering agent to reduce the calcium below 200 ppm. Keep your alkalinity in the middle of the scale and the pH between 7.2 and 7.6.