If you take the sponge apart on the inside at the opposite side from where you attach the air line from the pump there's a place to connect an air line. Here's how it's made: You'll need a filter sponge/floss, bio media, about a foot of airline tubing, a single hose connector, an air stone, and about 10 inches of 1-inch PVC pipe. It should fit snug inside the pipe and NOT fall out, but also be removable (for cleaning). Enjoy! Connect the air stone to the nipple or center of the bullseye using a small length of airline tubing. The idea is that the air bubbling upwards through the filter will draw in water from each side, and funnel it upwards, like a normal sponge filter.But I know a lot of the efficiency of a sponge filter comes from funneling the air upwards--the faster the rate, the more the suction.I don't believe I can do that with this design without losing surface area (which the whole point … Reassemble the sponge filter and connect it to your pump, place in tank, and you're ready to go. By this Simple Process Good Bacteria Grow in the Sponge and Helps to Convert the Fish Waste which passes through the sponge. Sponge Filter is a biological filter which needs an Air Pump to suck water from bottom of the filter and then passing the water through the sponge and exit through top. Take some charcoal (and zeolite) and fill up the top part, but don't overfill. ... Insert the air stone all the way down to the sponge. Im trying to make a sponge filter, i have the air pump, airline and air stone. Cut your sponge to make it roughly cylindrical. Take apart the sponge filter and remove the plastic strainer from the inside of the foam. Press the plastic grate back into place. 2 years ago. I tried to make one today but the flat part of the airstone was showing and the stream of bubbles was really strong, way to strong for my betta. 9. Connect to an air pump. And there you have it – a perfectly acceptable five minute simple sponge filter for a hospital/quarantine tank. The airstone is used along with 3/4” pipe for DIY sponge filters. By attaching a sponge to the intake of a breeder box, you’ve already created a sponge filter. The rising bubbles will create lift and draw water through the sponge. Cut a piece about an inch long and connect it there and connect an air stone to the other end. Hack # 4: Breeder Box Filter. If your tube is wide enough, add an airstone. Here is my sponge filter in action, literally five minutes after the idea popped into my head: DIY sponge filter in action. DIY sponge filter for bettas. You can take an air driven breeder box and turn it into a customized HOB filter that also acts a quarantine / breeder box. Remove the bullseye from the top of the strainer, and put the air stone at the bottom of the strainer. Get a square sponge and hang it at one corner of your aquarium. Fit the pipe and tubing to it and make sure they are both below the water level. Ok, put the sponge back in, into the lower part (make sure the airstone is dangling as low as possible, you want air flowing all the way up). It is made from a square sponge, air stone, tubing, and pipe. Drop-in your air stone and plug the air pump and beautifully your filter starts working. Step 1: Cut sponge. Click for more details. This stops the air stone from lifting from the bottom. Attach the airstone, so it is inside the filter body, dangling at the bottom. 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