After several years of not having this problem, a pool company pressure test (which broke through the pump basket seal during the test) has resulted in the problem returning.

The pipe coming out of the top of the pump has a slow leak. I left the pump off last night--this photo was taken after running the pump for 5 minutes:

http://home.comcast.net/~teach08/pipe5.JPG

After 10 minutes:

http://home.comcast.net/~teach08/pipe10.JPG

I took the short piece off, wrapped it with tape two times, then put it back together--now it leaks even faster. Should I use thread sealant? (I have the green bottle "Grrip" out there.) The pool guy should come and fix it NOW, but I'd rather not have him back again.