I am proceeding with the plan, but I have a question that I don't want to confuse with tomorrow's test report. My pressure reading tonight after last night's backwash and addition of 2C DE had only gone up 3-1/2 psi. Not wanting to risk backwashing out any of my first 2C dichlor addition and confuse my results, I decided to first add the nightly 2C of DE and let it sit for a bit just in case the psi went up. 45 minutes later, my PSI had risen to 30! Could the DE have acted THAT quickly? The filter was also leaking at the top. I did a backwash and I am now down to 20-1/2. The backwash water seemed clear or maybe light grey although it was getting dark so it was hard to tell. It was definitely not dark orange like last night. I did NOT add more DE after backwashing, just the 2C dichlor.