Why is my skimmer lid blowing off

PSC Ep. 75: Why is my skimmer lid blowing off?

In today’s episode of Poolside Chat, Rob and Matt tackle another common swimming pool question: 
When the pool pump shuts off water sprays up through the skimmer and blows the lid off. Why is this happening?

The most common cause would be air buildup in your filter. Air can get in there, either from taking the equipment apart for maintenance or through a suction side air leak. Air will build up in the filter all the while getting compressed as the pump is running. When the pump shuts off that air expands forcing the water back through your line, up through the skimmer and that’s where the lid pops off.

If you have return jets controlled via valves, and those valves are partially closed, not as much water can be allowed through to the return. Backpressure builds up and when the pump shuts off, the path of least resistance leads the water to flush back to your skimmer to blow the lid off.

Another thing we’ve heard from a few homeowners: if the filter is very dirty and it needs to be backwashd, the water will create back pressure and when the pump turns off it will rush back into the pool. I’ve never seen it happen myself. Their lives could be as dirty as their filter, but if it happens to you that might be one of the things causing it.

If you like these videos please like and subscribe. If you have any questions leave comments down below. For anything bullen’s ball visit inyopools.com. Thank you for joining us, bye.

 

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3 thoughts on “PSC Ep. 75: Why is my skimmer lid blowing off?

  1. Hi I have just had my sand filter changed out with a new more modern hayward from an old style. My pool guys recommended some new non sand type dust. My water has remained cloudy 2 weeks and now when i turn pump off water blasts lid off at skimmer. There is also some evidence of gravel on deck and in pump motor basket the finer underneath. They said it may be from the skimmer pit but I never had this happen until they changed the sand filter and ran some new pvc to my solar? Can you give me any ideas? There was some bubbles at the jets and in pump after filter done as well. Help! Thanks len

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