Problems with pressure, filtration, and Algae with DE filter. PLEASE HELP

Hi I have a ec75a de filter and am having a really tough time getting my pool clean, it has a lot of algae which has accumulated over the winter and every time I run the filter it clogs very quickly and the pressure rises to high within minutes of cleaning and running new de. After regeneration I usually only get between 3/5 minutes before the pressure rises over 20 and flow stops. I have already acid washed the fingers and rinsed them thoroughly with a hose. Any suggestions? Thanks!
 
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