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Sorry, I meant silicone based. Will edit the post Enviado do meu HUAWEI GRA-L09 através de Tapatalk

It's said that petroleum based vaseline will deteriorate the rubber, so you should always use water based vaseline. It must be ok to use in the impeller as it as no rubber parts and is safe for fish. Enviado do meu HUAWEI GRA-L09 através de Tapatalk

No The green part at the bottom of the image. Once I've bought pretty cheap a noisy and with low flow 2211, the only problem it had was the pieces were upside down. If the bottom one is restricting the flow, maybe the filter isn't able to purge the air. Well, sorry for my English, not sure if...

Have you put the riser in the bottom with the little feets pointing down?

Although I think that the filter( don't know about the media inside it) is well fitted to a 60p, what OP asked was about the swirl, so I only mentioned that. Not saying that you are wrong, just was not what he asked, at least directly.

It may be because of the film build up, that creates more tension in the surface, so that swirl is harder to achieve. Right after the water change you won't have any film, and 2 days after it may be not really visible but still, it is there.

Yeah, all the canisters I've had made similar noise in the first 2 or 3 weeks, then they start going silent. They need to develop a bit of mulm around the impeller

I've always saw them like that, coarse for pre filtering then biomedia, and filter floss should be the last step. At least in a classic 150, 250, ecco pro an jbl e901.

Hi Carpman, how good is the flow in the pro 4, I'm tempted to buy one for my 80x40x40 (128) liters.

Which one did you get?

Eheim quality is crap? Made in China doesn't mean it's crap! I know plenty of stores that just sell and use eheim because of their quality.