I have bubbles in the pump basket when the filter basket is in. I don't know what made me take it out and try it but I did and well, no bubbles.
The filter basket is free of clogs and little rocks..
I tried the hose dribble thing with all the the connections..no difference. This might be kind of interesting - or not...but if you look at the picture only the right side of the basket has bubbles. ???
I even tried the shaving cream trick last year, the saran wrap..you name it.
I'm getting trace amounts of DE back into the pool too. So slight that I'm not really sure...it's been windy and rainy here lately.
10,000 gallon in ground vinyl liner pool. 1 HP AO Smith Corp motor 3450 rpm, Nautilus Pac Fab Filter DE.