I have the DE filter fingers soaking in TSP right now, and will give them an acid bath later today.
Should I mount the top and tighten all the bolts, or should I leave it loose?
Last year, I left it loose and left the filter on its stand. I tightened it in the Spring. This year, I've put the pump in the shed and will also remove the filter. Just not sure whether it's better for the o-ring to be tight or loose. I suspect that it's better to be tight but want to do the right thing. It will be protected in the shed but will reach freezing temps in there.
PS - cleaning the fingers today was much easier than it was last year -- there was very little DE attached. I think it's because I cleaned it again in May or so.