Did you acid wash, before you cleaned it with detergent? If so, you may have ruined the grids. Check your filter manual. Sorry!
However, DE filters can ALSO rise in pressure rapidly because they are WORKING -- if the filter is effectively removing whatever's in the water, it may be operating 100% normally.
. . . Also, live algae blinds off, or plugs DE filters very, very quickly sometimes in minutes.
So . . .
1. Read your filter manual's cleaning instructions.
2. Get a good testkit, and then tell us what's in your pool. (Links below -- 'guess'-strips don't count!)
3. Tell us WHAT your water looks like and WHAT you've been putting in it.
+ Here are links to the kits we recommend:HTH 6-Way Test Kit @ Walmart
Taylor K2006A (3/4 oz bottles) @ Amazon
Taylor K2006C (2 oz bottles) @ Amazon
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