Uriel, an outstanding highly qualified technical specialist from Crystal Blue Pool Service, has diagnosed and fixed several problems with our equipment. For example he found that a mismatch between the impeller (previously installed in error by a Butcher Pool technician) and the motor of the main pump was causing air accumulation in the system, and installed the proper impeller fully correcting the problem. Uriel and also the maintenance personnel who perform routine weekly service on our pool are also very efficient and professional. My wife and I strongly recommend Crystal Blue. Their prices for their excellent service are very reasonable.