Thanks for all the help Ben, I went out after the storm and pressure had risen about 6 psi and it being late I back washed. Pressure back down to 10. Going to wait till morning to add more DE. I'm actually optimistic about this, I know it will take time. A question I have, when I backwash and the DE comes out and hopefully dead algae, can I see it? From what I saw on my backwash it wasn't real cloudy, and I back washed for about 2 minutes