Had Del Sol come out to see why my pool's pebble tec was looking stained and to see about getting a sand change. They came out and looked at the pool and let me know I had black algae. They treated the algae and the pool looks really good. Their pricing for the sand change was the cheapest I got after comparing a few companies and they even took the old sand away. The other companies were more expensive and would not take the old sand away. Would definitely use these guys again.