John, we have a waterfall with sandstone slabs making a roof for a grotto. But the sandstone is disintegrating and pieces of stone and sand are falling into the pool and fouling the cleaner and pump filters. Do you use a sealer to prevent this? Thanks
John, we have a waterfall with sandstone slabs making a roof for a grotto. But the sandstone is disintegrating and pieces of stone and sand are falling into the pool and fouling the cleaner and pump filters. Do you use a sealer to prevent this? Thanks