Bell, a couple of things. First you need to insert a "RINSE" cycle between backwash and filter, it cleans out the tank - without it, the debris that you've liberated from the grids but haven't gotten out through the backwash port will imbed itself on the, now uncoated, grids. The Rinse cycle should be 20-30 sec. Also, try backwash/rinse/backwash/rinse/backwash/rinse before inserting the filter cycle, you'll get most of the stuff out before the filter cycle but running the filter cycle will open a few new channels in the remaining de and allow you to get a little more out with another backwash/rinse. After doing this add 6 lbs of de to your 6020 via the skimmer (the label says 7.5, but that's only if you have a completely clean filter).
Too much de, 'overcharged' can obstruct the filter and cause a pressure rise, simmilarly, too little de, 'undercharged', can also cause a pressure rise as the grids weren't sufficiently coated and whatever was being filtered out imbedded itself on the grids (de backwashes off the grids fairly easily, algae, dirt etc tends to stick to them even when backwashing)
The best thing you can do to correct any previous over or under charging is to take the filter appart and clean the grids with a garden hose (it's easier with good pressure, but don't use a pressure washer) - you will get wet doing this, there are a couple of spots inside the grids that are very hard to direct the spray at. The wrench size for the bolts is 9/16, though you probably have the hand knob that came with the filter.
If you need any help with the taking it appart or putting it back together - just ask, I do it hundreds of times a year.
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