Pentair EasyClean DE Filter EC90 needs to be cleaned every 14 days due to low water flow. Please help

We have installed a pressure / vacuum gauge at the pump to get all the correct numbers to calculate the TDH and to make sure the pump is not undersized.

* Pool volume: 9000 Gallons / 34,000 Liters
* Filter: 90 GPM, Pentair EasyClean DE Filter EC90
* Pump...

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