I noticed a leak from the drain plug in the impeller housing of my main pump and tightening the plug didn't help so I bought a new one, applied silicone grease, but I still have the leak. I'm now pretty sure that it is coming from the housing into which the plug is being screwed because if I screw the plug in tighter, I get a strong flow of water from the plug area, if I back off the tightness, there is a spot where I just get a steady drip. I've tried wrapping PTFE tape on the threads, but that didn't seem to make much difference.
The three photos are the general area around the pump, a close up of the plug with a drip and a close up of the stream of water when I tighten the plug further (by hand).
Are there any compounds I could spread around that area and arrest the leak? Any other ideas?