Jun fifteen, 2020 Increase bookmark #13 @RIPoolguy19 @Lucky13F Have you the two removed the skimmer lid (with pump off) and lubed the o-ring beneath the lid, it doesn't just take a considerable hole with the strong pump to suck air in from the poorly sealed lid. Follow along with the https://pool.net/gartenpool-320-x-125-cm-komplettset.html