I just replaced my DE Filter grids (Nautilus 60) upon opening up the pool. I started the pump (Sta-Rite Max E-Pro) with only the skimmers open but it is not priming. At first, it did prime for a couple of seconds but then it stopped. It feels like the water pressure stops at the filter and doesn't go beyond it. Is there something I could have screwed up by replacing the grids? I also have a heater. Any input would be appreciated. Thanks.
Pool is setup like this:
2 skimmers, main drain, 2 returns, waterfall (never use), and a cleaning system in ground (never use)
By the equipment:
1 skimmer valve and 1 main drain valve > Chlorinator In > Strainer > Pump > Filter > Heater > bypass to cleaning system(never on) > Chlorinator out > 1 Return valve and 1 waterfall valve