air in sand filter

[CarlD]

There's almost certainly a loose fitting somewhere. It could be the multivalve isn't seated and tightened down properly, or a fitting into the filter isn't tight, or a pipe is cracked. Air's being sucked in.

[clayton2000]

thanks for the info, the problem seems to have been in the pump lid, I put some water proof lube on the rubber gasket and that and cured the problem...