Under Gravel Filter

[robadk1]

Wow, Rb. Once again you come through, I just now understand them, that's really cool... I'm very surprised I didn't understand that. One question though, what about that little hole in the top of the outlet of that powerhead?

I guess I dunno, I just saw it on drsfostersmith.com

WOW THANKS.

If anyone doesn't understand UGF's or RUGF's read that.

 

[Rbishop]

That hole on the powerhead out let, let's you attach some airline tubing that has one end above the water line or connected to an air pump and the other end goes in that hole. Then as water is pumped out into the tank, it entrains some of that air into the water. SOme folks like the look and others don't use it for chemistry reasons with plants and co2. If you are using the powerhead to drive a RUFG, you would not want to do this since it would push lots of air under the plates.

 

[robadk1]

What about sand, I mean... How do UGF's/RUGF's work around this? And with or without those filters, how do you vac sand?

 

[Rbishop]

The use of sand with a UGF or RUGF is really kind of self defeating. By the time you get a fine enough netting over the plates so the sand does not fall thru the plates, you decrease the flow thru the plates tremendously.

In a tank with a sand base, the gravel vacs take a bit getting used to. You basically hover the siphon tube close to the sand to entrain the debri, but not so close as to suck up the sand. Takes a little practice, but very acheivable.

 

[robadk1]

Wow again, thanks alot, and I hope, that i'm not the only one that just learned alot.