I would do that next time more for the benefit of cooling off the stones. On a hot day, I need to hose down the stones or you burn your feet. Probably happy with a pump running slowly too. Just monitor the output temp to see what pump speed is required to keep things under control. Basically a hydronic heated floor acting in reverse. If you wanted to get really fancy, you could heat the loop and have an expensive warm deck in the winter.My neighbor did a cool solar setup for his pool -- he laid PEX down under the pool deck pavers. It pumps a crazy amount of heat when the sun is out, the only mechanical part is a 3 way jandy valve. Cost him about $300 for the setup and it keeps his pool at 82f.