Monitor the water pressure gauge on the pool pump.
Pool pump pressure high.
Oversized pump if your high pressure reading has come directly after switching out your whole pool pump or pump impeller and motor assembly then you may have incorrectly sized the equipment.
Because high pressure can damage the filter and plumbing the pump should never be running when the multiport valve is closed.
Dangerous filter pressure if you do not have a functioning pressure gauge on your filter then you would have no idea if the pressure of the filter was dangerously high.
References trouble free pool.
Single speed challenger pool pumps for inground pools are designed specifically for applications requiring higher pressure operation to feed multiple needs beyond pool water circulation such as spa jets in floor cleaning systems and decorative water features like waterfalls and fountains.
Thermoplastic pump with closed impeller single speed.
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Pool filters and most pool equipment is designed to operate normally up to 30 psi.
When working properly the pressure gauge will have a measurement of 15 to 20 pounds per square inch.