I have an Intex Easy Set 18' pool with the 1500 gal filter pump. It's been working great up until about a week ago when I seem to have lost most of the suction. I've replaced the filter, checked the hoses and inlet\outlet valves for any obstructions, and found nothing. The skimmer is def below the water line, and if I take it off and just drop the suction hose into the water, I get very low suction as well. I've bled all of the air from the filter. My next thought was to maybe lube up the plunger valves and/or replace, but I wanted to see if there are any other suggestions out there in case the plunger valves aren't the issue. The filter is 2 years old and seems to be running fine from what I can tell.