The filter (canister) itself doesnt need IN MY EXPERIENCE as much maintenance on it.
However if you want my opinion on the TT spraybar, its pants, I gave up with it and took it off and just used the the pipes to create the flow.
what did you think was pants about it? is the ehiem easy open up and everything? im not saying this in an argumentative way just for is i buy another
/www.hydor.it/prodotti/show/famprod/9/list/3
they are often pretty noisy to start with, they do go almost silent, once all the trapped air is out, sometimes it takes a couple of weeks, others go silent almost instantly. I now have 5 eheims running, the most recent went silent within hours, some have taken weeks, just depends on how much air was expelled when first primed I guess.