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I have a love/hate relationship with my canister. It is a VA 650 Professional, old model that has been superseded by the CF1000.

It has fantastic oomhp and great media room, but is a bigger to prime and it is a little rattly, and lately the rattles have increased. usually it is just a matter of getting a little bit of biofilm on the impeller and rejigging the bioballs so they don't bounce around.

I have packed and repacked it. I've checked the impeller and housing, I've wiggled out all of the air bubbles, and still it is rattling and grinding away. It is getting worrying.

It doesn't sound like media when you get up close, it sounds like the motor. It is like a toned down version of the put-put you get when you first start up an outboard, but with more rattle.

I have had a look at the motor section. I opened it up and discovered that the motor itself seemed to be fully encased in a black box. It looked to be resin-filled, presumably to stop water getting in should water find its way into the top section (which it now is for some reason). The whole area seems intact.

Can anyone help me out? What should I be looking for here? Is there a seal in this area that might need looking at? Am I way off track?

For animals, the entire universe has been neatly divided into things to (a) mate with, (b) eat, (c) run away from, and (d) rocks. - Terry Pratchett

This also might sound silly it could be air in the media this often happens to me after I do a full media cleaning inn the large Eheim. Also check the inlet lines at any joints to see if any air is getting into the canister or any external seals.

Have a look in [link=My Profile] http://www.fishprofiles.com/forums/member.aspx?id=1935[/link] for my tank info

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Keith

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ok...

ive got a via aqua CF canister with the same problem, got to the point of unbearable, and then i took it off...

id take the impeller and the stick out, spin the impeller on the stick and see if it rattles... after checking out some of my other canisters last night it is supposed to turn much more smoothly, i think this is why mine and possibly yours rattled but dont quote me on it

---

''All the clown fish and yellow tangs in the world cant save you now!''

Hmm, haven't tried spinning it separately.

OK, new O rings and maybe a new impeller It really is unbearable unless you jack the TV up loud, and I can't put it in the stand because at that noise level it'd rattle the prawn to death

For animals, the entire universe has been neatly divided into things to (a) mate with, (b) eat, (c) run away from, and (d) rocks. - Terry Pratchett

New impeller and a new seal, and that dreadful banging is finally at a tolerable level! The impeller looks tons better, much chunkier and sturdier than the one I was using. The seal looked OK, but I replaced it anyway, I'll keep the old one around for spare

Thanks guys!



For animals, the entire universe has been neatly divided into things to (a) mate with, (b) eat, (c) run away from, and (d) rocks. - Terry Pratchett