No suction gauge.

I don't know if this observation would be comparable or just convolute the issue. I have a navigator vac that until this problem, for it to get into the flow spec per the hayward gauge: I would turn both skimmers off and drain valve 1/3 off, so the navigator would have max flow.

With this problem occurring to see if I could get the thing to sweep at all, with the drain almost closed off, skimmers completely shut down, could only get to low end of the hayward flow gauge...

Will see if I can locate an actual suction gauge.