Hi all, I'm running a ~3000 gallon pond through an Oase FiltoClear 8000 pressure filter from a 3690 gph submersed pump. I'm getting a constant trickle of water flowing through the backwash line despite the filter being set to flow back to the pond. I assume this is not a result of excess pump flow/pressure as the manual lists the filter to take up to a 4200 gph pump. Anyone know what the possible cause(s) of this would be and what I could do to fix?