Installed our pool last fall. Learning the science of chemicals has been a huge challenge. Now we have calcium build up on our lightwaves tile. I was told by our pool builder to use diluted muriatic acid to maintain the tile. I have since found out that acid eats the iridescent coating off of the tile. Grrrrrrr. :grrrr: NOT happy with our builder. Does anyone have experience with this type of tile? What's best to clean and maintain it?