Limestone (sandstone?) treatment

[tcat]

I've had this pool 14 years and have never sealed the 12" stone wall around about 1/3 of the pool.

New item by Tom C (TCAT)

photos.app.goo.gl

Is that something that's recommended? It tends to drop sandstone "dust" on the coping ledge. I splash it off and reddish sand goes into the pool. Do people normally leave this natural, or do they seal it with something? If so, with what and how often? Probably only about 35 sq.ft.

 

[HermanTX]

I sealed my flagstone about 8 yrs ago. It has held up fine. I had a 3rd party do it as I was also doing a replaster and other things to the pool. I found this picture and I think this is what they used.