Pool/spa is dirty; filter is not cleaning. Share Share Share Clean the filter. If the filter is dirty, it will cause an increase in pressure that prevents the filter from working properly. Cartridge filters need cleaning approximately every two months. D.E. filters need cleaning two to three times a year. Topics Pool/Spa Related Posts Reset the circuit breaker at the sub or main electrical panel. There is no power to the equipment. The pool or spa light will not turn on.