I'm on well water and recently replaced my water softener and added a whole house backwashing GAC filter for sediment and taste/odor, both have a Fleck 5600SXT head, 48k grain capacity on the softener. GAC is just after pressure tank followed by softener. System worked fine for better part of a year but started to see where house water pressure would drop to a trickle after a few minutes of start of a shower, sink, etc. Troubleshot and found that if I bypassed the filter it corrected the pressure and was fine, so isolated to the filter. Tried multiple backwashes on the filter but no change. Pressure per the gauge is over 60-PSI and appears to consistent. Any thoughts?