Hello All - Just discovered the site and hoped you all might be able to help. Purchased the house about 7 years ago and pool was already built. There was already some of the white discoloration you see in the attached pictures, but over time, it has gotten much worse. Never bothered me too much but now getting to a point where there is almost as much white as there is meant to be dark blue (especially on the shallow end). So is this scale, metal, calcium or just normal wear? My water comes from a well over 300' down and while tasty, is rather hard (400) so I wondering if that might contribute to the problem. Would love to hear what it really is and if it can be remedied and how. Afraid I am going to hear that it will need to be re-plastered......Ugh. How much is that for a 15' x 40' pool? I dont think I want to know.