Near the top of the other end of PVC drill a whole and thread the airline tubing through this hole. This stops the air stone from lifting from the bottom. Take apart the sponge filter and remove the plastic strainer from the inside of the foam. Airstone inside pipe. 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. By this Simple Process Good Bacteria Grow in the Sponge and Helps to Convert the Fish Waste which passes through the sponge. It is made from a square sponge, air stone, tubing, and pipe. Remove the bullseye from the top of the strainer, and put the air stone at the bottom of the strainer. The airstone is used along with 3/4” pipe for DIY sponge filters. Here is my sponge filter in action, literally five minutes after the idea popped into my head: DIY sponge filter in action. Cut your sponge to make it roughly cylindrical. ... Insert the air stone all the way down to the sponge. Take some charcoal (and zeolite) and fill up the top part, but don't overfill. By attaching a sponge to the intake of a breeder box, you’ve already created a sponge filter. Enjoy! The rising bubbles will create lift and draw water through the sponge. If your tube is wide enough, add an airstone. 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. 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). 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. 9. Im trying to make a sponge filter, i have the air pump, airline and air stone. Connect the air stone to the nipple or center of the bullseye using a small length of airline tubing. Fit the pipe and tubing to it and make sure they are both below the water level. Step 1: Cut sponge. 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. Attach the airstone, so it is inside the filter body, dangling at the bottom. 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. Reassemble the sponge filter and connect it to your pump, place in tank, and you're ready to go. 2 years ago. DIY sponge filter for bettas. Drop-in your air stone and plug the air pump and beautifully your filter starts working. And there you have it – a perfectly acceptable five minute simple sponge filter for a hospital/quarantine tank. Connect to an air pump. You can take an air driven breeder box and turn it into a customized HOB filter that also acts a quarantine / breeder box. 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