Plastic Bottle Aquarium Filter

Make an aquarium filter for your tank out of plastic bottles! Cut off the neck of a plastic bottle that can fit in your fish tank, use a heated fork to poke holes around the neck and insert the neck into the bottle with a PVC tube in the spout. Insert an airline tube in the PVC tube, secure the airline tube in place with a piece of sponge and pour gravel or sponge charcoal into the bottle. Cover the gravel with filter wool and place the filtration device in the corner of your fish tank to clean the water.