[gmat]

Originally posted by myv65
Are you certain it's cavitation? It could also be simple vibration of the pump. Two things you can do to verify.
(snip)

Good points, i had already verified though
It's mounted on 1cm of noise-killing material, and decoupled with neoprene foam layers from the case which itself is fully padded in noise-insulating material... No vibration, sir, i'm positive about that, sir.
Ah and it is the noise it makes in the sink when i cut the flow manually.

Increasing pressure) You can put a water column open to atmosphere [...] (snip)

I like my closed, stealth black cube. Besides i'm in closed loop, and i dont want water to get in contact with ambient air (bacterias etc...). Oh and lugging the cube to LANs is a must, as well.

If you really want to get funky,

Now that pleases me Let's see:

[...] Be warned, though, that overpressurizing an accumulator will cause fittings to blow.

I like that ! Sounds *fun* to me. (quite like this: "-Do not cross the streams. -Why? -It would be Bad.")
More serioulsy. I suppose that one places the accumulator just before the pump inlet, right ?
Where could i find this kind of gizmo ? Pet shop ? (i imagine the stares i'll get when i'll ask for this kind of thing. Oh well, such is life)
I have a small airtrap. Is it a problem ? (yes it has tight o-rings on both ends. i'm more concerned with the residual air pocket inside the trap)

Decreasing velocity) You can open the suction line as you have proposed.

So you say it would work. Porting the "suction cup" would not be too hard, considering it's only made of plastic.
The outcome would be a decrease in pump efficiency, i suppose, as the design is based on incoming water velocity and tight impeller housing design. What i would not want is losing efficiency and keeping that cavitation noise...