I have a Hayward S310S sand filter and took it all apart because I was suspecting a damaged lateral. During disassembly, I noticed that the upper elbow and diffuser just pulled apart easily, but the lateral assembly was bonded or puttied to the lower elbow and the flange ( aka bulkhead fitting according to the manual).
I ended up having to put the lower elbow in the vise and use a 2x4 to twist the lateral assembly off of it. It seems like it wouldn't need to have glue since it has 500# of sand sitting on it and even backwashing probably wouldn't make it move.
When I reassemble it, should I use putty or glue or just press the pieces together?
Thanks in advance