Hi ,
i have air constantly building in my sand filter which is then returning into the pool. Firstly I have checked and replaced all the O rings , seals , had the pump checked by the manufacturer, relaced the multi port head, looked behind the skimmer box and even a mate who is a pool builder, he looked at the issue and we can't identify the problem. I have a 3 speed pump , it primes well, however 5 min after running it switches to its 2nd speed and this is where the air builds in my system .. could I have an air leak in the main intake line ? if so wouldn't i be loosing water ( I am currently not and have performed a bucket test) or could it be the sand filter ? Help would be appreciated if anyone has come across this before ..
Cheers