ok guy's . after 16 yrs of a sand filter and now this is my 2nd yr with a de,i'm having the same type of problem. after running the filter i have stuff all over the bottom of my pool. it looks tan to greenish color and we will vacuum it to waste and then add water again and the same thing the next day. i've already replaced the de once by cleaning or flushing the de per the filter instructions and added new de, then i flushed it again because the pressure would go up 10 lbs in a 1/2 hour. this time i took it apart and cleaned the fingers and flushed it out good and added new de. 6lbs per hayward EC65 specs. my pool cleared up but i still get this stuff back into it after running the filter, very frustrating. any ideas on this? My chemicals seem right on and i added a bunch of algaecide already. i would like to be able to run my filter overnight and not have to vacuum every time. thnx Randy