What is that white ring around my swimming pool and what can I do about it?

What is that white ring around my swimming pool and what can I do about it?

What is that white ring around my swimming pool and what can I do about it?

What is this white ring around my swimming pool?

From Pool Services Tech

So you have finally designed and built your dream pool.  You host wonderful pool parties, and have neighbors raving about your permanent staycation that you have created in your own backyard.  After a few months, unbeknownst to you as your swimming pool contractor never mentioned how complicated swimming pool water chemistry can be, you notice an unsightly white ring forming on the perimeter tile of your pool, on the spa spillway, and on your water features.  

This is a common problem, and is inherent in the chemistry of swimming pools.  Click here to read about its cause, and what can be done about it.