My booster pump is drawing water from the pool, but my sweeper won't run when I turn it on. I pulled the sweeper vacuum out of the pool while I had the booster pump on, and it behaved as though it were turned off. I checked the pipe from the intake line, and the pressure is just fine. But when I plug it back into the return line, nothing! So I have to assume there is a clog in the return line somewhere. Is it safe to put a garden hose bladder in the return line to try to clear it and blow it out? Thanks in advance.