<a href=showthread.php?s=&postid=12865492#post12865492 target=_blank>Originally posted</a> by SOLANA34
do you get a lot of trickeling noise since you chopped it? i would imagine a waterfall noise
With the black filter sponge in place (see the second picture) after doing the cut out, there is no additional noise. The water doesn't make it past the black filter sponge.
Without the black filter sponge, there is a lot of noise. In picture 3 you can see the water flowing out of the overflow box through the cut out. This water ends up on top of the 9002 and reduces it's ability to skim.
The black filter sponge is critical to success with this modification. It eliminates any additional noise and stops the 9002 from getting drowned by the overflow stream.
Ed