working a DE filter

[kaybinster]

As long as you have good water flow pressure really does not matter, what you want to look at is increase in pressure over time. You should record the pressure when you first coat the filter and then backwash it when the pressure has increased by about 5 psi.

[rrwcm]

re: how much de I need?

I was told that my 25000 gal pool needs 7 one pound coffee cans of DE each time I clean it. This is also supported by the chart on the DE bag. I was also told to add it slowly thru the skimmer without mixing it with water first. This forum seems to advise premixing it. I would appreciate any advice on this - should I premix or add directly to the skimmer?

[kaybinster]

Always premix it with water to get a nice slurry otherwise it will clump up in the filter rather than properly precoat the filter.