SCWD and unfiltered water

[monza]

I have three- one about two years old, one just over a year, the last one just under a year. All work great, no noise. The only cleaning I've done was thinking about I should be doing some. (knock on wood) All three have different flow rates. So I don't know what to say why some work better then others? Yes Wai's does carry them.

On another note I'm upgrading my tank and want way more flow I'm pretty sure I'm going to try the Ocean Motion set up, just deciding on pumps for it.

Dave