Bought this to replace the foam pad that I have long used in the high performance AquaClear 20 filter. Can be used straight out of the box. I just took an old foam pad and rinsed it with aquarium water. I then used the rinsed water from the old foam pad to soak the new foam pad for a minute or two before popping it into the filter. This way you will get some of the necessary bacteria in the new pad so you can prevent the aquarium from going into a new cycle or full cycle.
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