I *think* I foudn the problem - or at least a large part of it. BOTH drain plugs WILL NOT TIGHTEN (ugh) It appears that the inside threads are worn. So it's not as easy as simply replacing the plugs. So I guess that means buying a whole new basket/configuration? yuck. Then it dawned on me, if I'm considering trashing the existing unit, why not first try to seal the drain plugs somehow - even if it is a permanent bond of some sort at least it would get me through the summer. any suggesitons/ideas? I suppose pvc glue would work but I wonder if something less permanent might work...hmm...btw: i did try threading the plugs with tape and when I did that I did see a slight increase in pressure - and the pump is surging again. so that must be it...i hope