After having two pools in Mesa, AZ, and trying to figure out why my friend's pool (who by the way is a chemical engineer) was always sparkling compared to ours, it's actually quite simple. Once we figured out the basic chemistry behind it, our pool looked just as pristine and we did not have to spend hundreds of $$$ to have the calcium line removed.
Do you know the fastest and yet effective way to remove the ring around the pool?
It's muriatic acid, otherwise known as hydrochloric acid (HCL). The acid dissolves the hard mineral deposits as well as mold and mildew. So, if you find a white ring around your pool, raise the water leveler above the calcium line. Once the water is above the calcium line, pour in more than the usual amount of muriatic acid. Test with pH strips for normal reading prior to re-entry.
I was so impressed with the results, I wondered why pool companies never do this? Instead they offer draining the entire pool and doing something called "bead blasting." I think it's a pretty effective process, but way more laborious and more expensive than adding a little acid.
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