You should probably dump off the filter media and get new stuff. I'm sorry I don't know exactly how to use it, but I do know its a made for walmart brand and you should be able to look at a box at walmart for instructions. It's an HOB (hang on back) filter right? What they are is basically sponges and a power pack that pumps the water through. For five gallon tank you might just be better off buying a new underwater filter for a few dollars than spendin money on filter media for an old filter. I heard the wisper filters are loud but I have a stingray filter that you suction cup to the glass and it is very quiet. The only time it was loud was the first few hours when the media was settling. You do need to put an extra sponge of your own in the middle so there is enough room for bacteria. http://www.petsmart.com/global/produ...N=2030113&Ne=2
here is a petsmart add for one, but I got mine for 6 bucks at another pet store





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