I have a small leak coming from the nut that sits on top of the pump between the pump and my sand filter. A small trickle of water can be seen run down the pump. Could this be the reason I am getting air in my system, because I see a spurt of small air bubbles coming out of my return periodically?

My next question is, can I get by with applying some silicone sealer to the leaking area or should I try and disassemble and repair? This looks like a tricky area to replace so silicone sounds a whole lot easier for me.

Thanks.

Riles