mbonev

I really like the Orenda products.

That is a little strange. Does the same behavior occur any other time? This did not happen before the sand was changed. I would try to back wash the heck out of the filter and try again, my thoughts are that something is wrong there and bottlenecking the flow a bit. If it were seals or the impeller (which hardly has any issues) the behavior would be occuring without the use of the vac. Also check your vac hose so that their may be air coming in there and causing the prime to be lost in vac.