Needlewheel Spinning sound in My Macro

[Archilles19]

You can achieve lesser micro bubbles by using filter sock....heck....if no money just use a clean sock of yours.....must be clean ah.....not the one U just took off.

But there's one set back.....the water level might just be affected & U need to monitor this often...if not overflow. Then U face problems like sock get dirty quickly.

If U want to use sock then you must make sure that the outlet hose is hanging at a distance from the sump water level the U fix the sock slightly immersed in water but rest assured that there will some micro bubbles ....definitely lesser than before.

Try lah.....don shy......

[Archilles19]

Oh...BIF.......to reduce the bubbles further U can divert the oulet hose far..far away from Ur return pump......

Again......try lah....don shy

[Zappy Kiwi]

IMO, the noisy sound of the needlewheel is caused by the gushing sound drawing into the narrow air-intake valve (by simple physics, like if u blow into a straw, it will oso create a noise. ) So to reduce the noise, just add diffusers to the other end of the air tube.

RockLobster, for ur info, I used 2 air diffusers to muffle the noise. The air diffusers I used are from the powerheads I purchased which have a air tube for the venturi effect. My air diffusers inside contains cotton wool, so I think it is the cotton wool that actually helps to muffle the noise.

cheers.