I have an old in ground pool, probably built in the 50's. I installed a Pentair whisperflo 2 speed pump last year and everything went pretty smooth. I also have a 48 sq. ft. DE filter with new grids. All of the original lines appear to be 1 1/2".
Everything was running normal last week, I did have a couple of small leaks but I took care of them. Here's the problem, when I start the pump everything is fine for about 10 seconds and then it will lose suction then it will build pressure and then lose it. This cycle will continue over and over. Again, no discernible leaks, filter is clean and the water coming into the pump is clear (no dirt).
Does anybody have any suggestions?