I have a Pool Shark automatic cleaner which is fine and I have also borrowed a friend's Hayward Pool Vac Ultra. Both will climb the walls of my plunge pool all the way to the top but only if I increase the suction above the recommended maximum according to the Pool Shark's supplied flow gauge. I have only done this briefly as I wasn't sure if I was straining my equipment. I normally have the regulator on the skimmer plate set such that suction at the end of the hose is at the recommended maximum setting according to the flow gauge but at that setting it will only climb the bottom of the walls up one or two feet at best.
The Pool Shark manual says, "You have too much vacuum if the PoolShark sucks air when it climbs up to the water line." This is not happening in my case. I’m wondering if the included flow gauge is conservative, trying to avoid this situation which I don’t have.
Is there any harm in increasing the suction via the hose provided the cleaner does not suck in air at the top? Will the increased suction put undue strain on my pump etc?