I've got a 1hp Hayward RS-1000 and there's a lot of air passing through the system.
I've got a Clearwater C170 chlorine generator and there's a lot of clear plastic for viewing with this thing. There's quite a bit of air flowing through it in the last couple of weeks and the pressure on the filter gauge has dropped from ~15 to ~7 (sometimes as low as 4).
My first suspicion was the o-ring on the basket lid because it was flat and hard, but I changed it and it didn't seem to help at all.
I can't find leaks in any of the plumbing so I'm guessing the seal on the pump is letting air past and needs to be replaced.
I can't seem to find a reference to the RS-1000 on any of the online pump supply places and was wondering if this model has been replaced with another one or if a seal from another pump will fit.
Also, what are some other possible sources of air in the system? Could it be coming the selector lever on the filter?
Thanks for any info you can provide!