I am here trying to help a friend (and to interest him in coming to the fourm).
The pressure on the DE filter is starting out normal and rising to 30 psi within an hour. When the filter is shut off, it goes back to normal then takes an hour to rise again. I know nothing about DE filters but it sounds to me like this is a mechanical issue.
Jeff said he cleaned the DE filter. Then he added 3 scoops (pounds?) of DE. Something wasn't right (Jeff is not here now so I'm trying to recall) so he called the pool store and they said that wasn't right he needed to add 7 scoops. So he added 4 more scoops.
I will be able to add more info in the morning regarding filter and pool specifics. I have no test data. Pool is not completely clear and has a slight green tint, just a bit. Jeff said he shocked it twice (bag of cal-hypo) and uses tabs for chlorine. The heater was on for the pool party and these issues were going on before all the kids and dogs were in the pool. I'll try to test the water in the AM using whatever they have for testing and will post that data as I get it but I am sure that what is immediate is a mechanical issue.
Is there something that went back together wrong that let DE into the pool so that the filter is not filtering right now - how would the pressure rise? Or is there something in the lines somewhere? I did notice rubber duckies in the skimmer, maybe one got sucked into the lines but how would that create this rising pressure?
In over my head, can anyone help?