I have a DE pool filter. The DE appears to be coming out the pool jets and my preasure is around 25. When I backwash my preasure will go down to its normal level of 15 but slowly climbs back up. I have replaced the grids (fingers) on the filter 3 years ago and it has worked fine. My motor is less then a year old. Is it possible I need a new filter all together? The price I was quoted for a new filter was $975.