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!