I have had a variable speed pump for three years and have been pleased with it. It has been running at about 310 watts for 12 hours daily with clean filters. When the watts go up to 410 I backwash the system and start over again at 310 watts. The system has worked well until recently. A month ago I noticed my pump was running at 515 watts so I backwashed the system. Then, even with clean filters it continued to run at 515 watts. I backwashed again to no improvement. I inspected the water inlets to the pump and cleaned the pump bowl and found everything in order. What could be the problem? I switched to the variable speed pump to save electricity, but at 515 watts I am no better off than with my older fixed speed pump.
I have a Pentair Intellliflow VF pump with Intellitouch control system. My filter is a 48 square foot Haywood DE, and the pool is 10,000 gallons.
Any constructive advice would be greatly appreciated.