It has been a while since I visited the site (been enjoying the pool)! I attached some pics of the wall after all these years. First off, the hardness of these stones varies from hard aggregate to soft sandstone. The softer rock did erode as expected. What I noticed most is after a rain, there would be sand sediment on the bottom of the pool that washed off the rocks. Not a big issue as they were easily vacuumed up with the Pool Blaster Max. I was aware this would happen by researching this forum and decided to move forward with the wall. The water moving over the stones caused this also.
A green line of algae started forming just above the waterline soon after the pool was built. It remains today and has had no effect on the water or any walls under the rock. You can see that in the last pic. I could blast it off with a pressure washer followed by vacuuming the bottom but it would soon return.
Several types of stone sealers were used a handful of times, mainly on the tops of the wall but it barely lasted half a season out in full sun and weather. It did look good for many years as the erosion was gradual. If I had to do it again (which will happen after this season is over), I will choose a harder stone that will be less prone to erosion.
A green line of algae started forming just above the waterline soon after the pool was built. It remains today and has had no effect on the water or any walls under the rock. You can see that in the last pic. I could blast it off with a pressure washer followed by vacuuming the bottom but it would soon return.
Several types of stone sealers were used a handful of times, mainly on the tops of the wall but it barely lasted half a season out in full sun and weather. It did look good for many years as the erosion was gradual. If I had to do it again (which will happen after this season is over), I will choose a harder stone that will be less prone to erosion.
