Originally Posted by Andy Sager
If you are going to suction the tube to the tank wall, there is no need for the gravel. I just made some filters using PVC
parts and made the holes start just above the small rocks ( for weight) so that there is all flow through the sponge , top, bottom and sides. You don't want to impede the flow through the sponge unless it's for another media like a carbon bag. (Last resort type modification.) It will create dead spots in the sponge.
Hope this helps
What did you use at the bottom to hold the gravel in? Just a slip cap? Looks like I will need to make another filter with more holes where the sponge is.
Originally Posted by Mebbid
This is my third attempt at a sponge filter. I cut dozens of holes beneath the gravel line with a utility knife. I made sure to cut enough that I could breathe normally with it covering my mouth if that makes any sense. I layered gravel on the bottom, filter floss above the gravel, and then 2 layers of filter pads on top of the filter floss. I cut a notch in the lift tube to snugly hold the air line. Then I ran an air tube into the lift tube and put a bubble stone on it.
To get everything to fit together I cut the bottle in half and worked with it to nest the bottom inside the top snugly. All together they took me about 10-15 minutes to make.
It's not pretty but it worked amazingly well for my breeder tanks.
It looks good! I need something smaller for the 1 gal
. fry tank but I can use something like that for my QT. I will have the filter set up in my daughters 10 gal
. For when the QT is needed.
Will post pics of the next build. Probably going to use PVC
for the 1 gal
. Thanks for the help again!