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Things are still working -- but while replacing my pre filter, I noticed my 10" "big blue" housing has 2 rings!
Wonder what are the chances I can find the right rings for that one. :o

Well, interesting solution... But would have not worked in my case. (1) the system is already installed. (2) they insisted that using any kind of paste is a very bad idea (3) I kept calling until...

it is (medium dark) blue, the top is black.

Thanks -- but I see no markings whatsoever on the canister.
How can I tell (shy of calling the outfit that sold me the system)
who made it??

I agree that the ring-in-a-groove is not a great...

Our whole house system uses both a pre and post filters.
Both are in BB housing -- the pre is 10" and the post is 20".
I was trying to replace the filters, and the 10" one had not problems,
but...