Can anyone compare the FX5 to the eheim 2262?

[tcarswell]

 

[Jgray152]

Big words, wrong concept.


You should familiarize yourself with the science behind principles before you use such terminology. Otherwise, you make members believe you know what you're talking about ...

First you can stop being a punk. Second, doing research for weeks, this is what I found. If this is not it, fine, correct me, but don't be a punk about it.

I did look in to vapor cavitation HERE a while back and this, possibly until now, seemed to explain the reason.

 

[Jgray152]

Doing more research, it seems, correct me if I am wrong, this now makes me want to install a pressure gauge on the canister of my FX5, degasification seems to be the same as vapor cavitation as both happen under negitive pressures. The desolved gasses in the fluid will be released as the pressure decreases to the correct point.

 

[Jgray152]

- and the microbubble issue is NOT because of 'classical' cavitation like this.

Than what is it from?

when you reach the boiling point of water (now much lower because of the incrreased pressure) when the bubbles collapse they can do big time damage to impellers/pump housing - of course these, are huge pumps with massive impellers. you should see the damage that real cavitation can cause..

Typo? Decreased pressure.

but you won't get this form of cavitation on an aquarium pump that small. no matter how long you run it against a closed valve or, clogged media.
it simply won't happen.

Than what are these bubbles from than? They only occur when the media is clogged. This happens on every Fx5 on the market. Coincidence that it only happens to the pump that uses a highly efficient impeller? I agree your standard aquarium pumps would never do this. Straight bladed impellers are not very efficient.

You should see and feel the canisters walls get "sucked in" when you close the intake valve. Now im sure some of this is because there is no head pressure pushing against the walls any more, but I have never heard the noises and felt any canister walls get "sucked in" like on the Fx5 just because you close off the Intake.

 

[tcarswell]

Than what is it from?

Typo? Decreased pressure.

Than what are these bubbles from than? They only occur when the media is clogged. This happens on every Fx5 on the market. Coincidence that it only happens to the pump that uses a highly efficient impeller? I agree your standard aquarium pumps would never do this. Straight bladed impellers are not very efficient.

You should see and feel the canisters walls get "sucked in" when you close the intake valve. Now im sure some of this is because there is no head pressure pushing against the walls any more, but I have never heard the noises and felt any canister walls get "sucked in" like on the Fx5 just because you close off the Intake.

Is the impellar on the 2262 similar to that of the FX5 ? Or is it the old style?

 

[Leptar]

Sounds like the polishing pad is getting clogged slightly

LOL...

slightly...

First pic is the blue pad and under it is eheim rings
Second pic is a mixed tray with bio max and substrat pro
Third pic is the last tray with substrat pro and a polishing pad on top...

I could grow plants off that polishing pad

 

[tcarswell]

DAMN! Looks like my ehfisynth pad I just took out of my eheim classic. It had been running for only three months. Apparently it did its job well.

Thanks for the update!

 

[Jgray152]

Is the impellar on the 2262 similar to that of the FX5 ? Or is it the old style?

From what I understand, it uses a straight bladed impeller. One of the reasons it probably consumes more power. There is no "old" style. Straight blade open impellers work fine for what they are intended to do, they just are not as efficient as closed impeller.

Leptar, I thought you did a flow test for a 2262?? Darn it!

 

[tcarswell]

From what I understand, it uses a straight bladed impeller. One of the reasons it probably consumes more power. There is no "old" style. Straight blade open impellers work fine for what they are intended to do, they just are not as efficient as closed impeller.

Leptar, I thought you did a flow test for a 2262?? Darn it!

I see I would think eheim would beat fluval to the punch on new age filter designs.

 

[Jgray152]

Well, if Eheim used an enclosed impeller and designed the impeller house correctly, they would cost $300 MORE. lol.