I have recently switched to suction side cleaner after my polaris was failing to often and never picked up dirt really well. The pressure line I know for sure is 1", when it comes down to using it as a suction line the general opinion is a "no" on these forums, but with the right pump speed and diversion with a 3 way valve the hydraulic flow should not be an issue other then the pump having extra pressure, so why is the answer always a no?