Adding DE to Sand Filter; I Know, I know but idea not addressed in Sticky above

[MikeInMo]

Well it took 5 and 1/2 cups to get a tad more than 1psi increase.
Took forever doing it a half cup at a time with 20 minute pauses between each new addition. Still amazed at the amount it took even given the size of my filter. Course last year I rarely had to backwash because the filter is somewhat oversized.

Didn't see any floaties in the water, neither DE nor the normal things I was seeing float in front of the lights. I'm looking forward to seeing what it will look like tomorrow afternoon.

Is there something wrong that I needed that much DE?

[Jeffski]

Keep checking your pressure! Mine takes a lot longer than 20 minutes to increase... sometimes a couple hours.