Pool Vac Causing Major Air In Pump Basket

[FLOMOPOOL]

Hello all -

I just went to adjust my Jandy valves to run my Hayward XL pool vac. I have a suction side inlet on pool wall for vac.

First I fully opened the vac valve (by closing the main drain valve).

Next I fully closed the far skimmer valve (thus allowing suction from now fully open vac valve).

But when I fully close the near skimmer valve I got massive air in the pump basket (which goes away when I reopen that valve).

I checked each piece of vac hose and all good there.

Is this happening because the vac hose is too small relative to the 2" pumping my pool has ?

 

[Rancho Cost-a-Lotta]

I think it's just a matter of having too much suction for the hose. As you're closing that last skimmer, stop and back off when the pump begins to cavitate or suck air.