Hello all, I am currently putting together my DE filter (perflex EC65) for what I hope to be a smooth opening this year. I came across a problem while reassembling the top tube sheet of my filter. I set the top tube sheet with the smooth side down when I dismantled the filter in the fall however it doesn't look right. I would like to verify with someone, if possible, which side of the top tube sheet faces down, the smooth side or the side with the ridges.
Any information would be greatly appreciated.