One reason could be that you have a clogged impeller. This means that debris may have gotten past the pump basket when it was last removed for cleaning or due to a crack in the basket itself. If this happens, this debris can clog the impeller, the only moving part in the pump that pushes the water through.
When this happens, it’s not putting enough pressure back through the system, which can be a problem and reduce the water flow into your pool.
You can attempt to repair a clogged impeller yourself, but it’s recommended that you contact a professional to help you.
Another reason for low pressure could be a cracked or damaged impeller itself. And within the pump housing, you also have diffusers and diffuser O-rings – any of which could be worn out, broken, or missing.
If that’s the case, you’ll need to take the entire pump and motor apart to diagnose and repair it.
Again, it’s highly recommended that you contact a professional pool technician to help you with that.
Bad Pressure Gauge
Another likely culprit, and simplest, is needing to replace your pressure gauge.
If your pool has good flow and it’s circulating well, but your pressure is really low, tap your gauge to see if the needle moves. It may be as simple as having a faulty gauge.
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