So I've had a lot of problems with my filter and pump. I have backwashed and took out my DE grids and cleaned them down and my pool system still seems very weak. The pressure of my tank is unusually high (20-25) after backwashing. One thing I have noticed is that my vacuum does not work at all if I set the system to full vacuum. If I set it on half skimmer half vacuum it barely works and is slow, but is actually moving as compared to when it is set on full vacuum. I have changed some of the orings in case of any leaks but I can't seem to find the issue. If you look in the drain skimmer basket while it is set on just vacuum you can barely see the water moving, so I am sure it is an issue with my pump/filter system and not the vacuum.
Any help would be appreciated.