I am having a huge problem with scaling all underneath the waterfall area. This never happened the first 7 years of the pool, but has gotten progressively worse over the last year. I can clean it all off only to have it return in a few days time. I take my water in to be checked and stay on top of anything that's needed. They say it's leaching out of the stone and sealed it for me last fall. Didn't help. The photo is from last year. Of course over the winter it has gotten quite thick. (It's pretty hard to clean this area from outside the pool.) Is there anything we can do? This is ugly and very time consuming. Thanks in advance for any suggestions!