This pad is designed to absorb toxic ammonia from the aquarium and as a preventative measure to avoid ammonia spikes. Especially useful after moving an aquarium, doing a large cleaning on a tank or after a power outage where the the balance of the tank has been disrupted. They can easily be be cut down to the size of your filter for a perfect fit.
We are often asked "how long do these last?" It depends on the amount of ammonia, the only way to tell is by measuring ammonia. The more ammonia in the aquarium, the faster it will be exhausted.
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