I'm a recently new pool owner and I'm having an issue with the pressure in my DE filter. When I have the water coming through the skimmer my DE filter pressure is great. However, when I have the automatic pool cleaner running the pressure drops considerably and the automatic pool cleaner at the bottom of my pool runs slow. I've also noticed the return water doesn't seem to be flowing as high as it normally should. I should note that the pressure when using my automatic pool cleaner has been great, but has deteriorated over the last few days.
I've taken apart the DE filter, given it a good cleaning, purged the air, added DE, cleaned the motor's propeller, sealed the strainer lid, etc. However, I'm stumped why my pressure would be good one one setting, but not the other. Hopefully the lingo I've used is correct and painted a clear picture. Thank you for the help.