Hi all - Pentair 420 cartridge filter. Cleaned the filter and replaced the rubber O-ring because original was stretched out and appeared to be leaking air. New O-ring was thinner which allowed the clamp to be tightened down much further. I put lots of lube on the O-ring. Now, perhaps unsurprisingly the pressure is higher than before, but this has caused my suction cleaner not to work/work as well. Pressure is about 11psi when running at 2900 or so which is my higher speed for half the day. At the lower speed the cleaner will not work at all.