Emphasis on sanitizer levels and ph monitoring is well-known by most operators and service people. What is less well understood is how dependent successful pool management is on proper operation of filters, circulation and other areas of chemical control. This seminar will demonstrate that proper control of all three factors: chemical, biological, and physical is needed to provide healthy clean water. At the conclusion of the seminar the service person or operator will understand how each of these key factors interrelates with and helps control the others. Additional knowledge will be gained in how to correct unbalanced water and utilize other tools such as algaecides and sequestering agents to improve overall water quality.