I think my waterfall is decaying, to the point that I am beginning to worry that it could actually break should I step on the cantilevered part that hangs over the pool. Every day the Polaris has a tablespoon or 2 of sand and each pool of the waterfall has a base of sand in it. When I touch the waterfall I get sand on my hand. There is always a bit of sand beneath the waterfall.
I worry (at 3AM when I sometimes wake up and worry about stupid stuff that may or may not be my fault) that trying to adjust the TA lower with MA and running the waterfall has eaten through some coating that may have been there. No one mentioned to maintain anything on the waterfall rocks, I dunno if there was a coating that I have damaged.
Around here, we actually tend to call these rocks "Moss Rocks" and I think they are softer than flagstone.
So, what do I get, how do I use it? Dry the rocks, siphon out the standing water, paint or spray something inside the waterfall cavities as well as the spillway rocks? What about the coping of the pool, I see at least one rock where the grout looks like the rock itself has worn away from where it used to be by maybe 1/4".