Something I observed when I had three filters feeding the same tube with colour coded routing:

After a while one filter stopped working and on breaking its exit pipe I got a shower of items from the other two filters, implying that a filter can get blocked by another filter's items.

Provisionally I've painted the outlet tubes.

Incidentally another awkward behavior is that the IC pump will spit water cells if it doesn't have a chest to put them in, making it tricky to use inline. If the chest is full then it spits too. Currently I'm using a regulator to 'look into' the chest and turn off its power when there's a stack there.