This product is similar to the Python No Spill water changer, which is probably much older than this Aqueon. These water changers work but if your fish are sensitive to fresh tap water, it is best not to use it. It's good for making your life simpler though. If you do use this, you ought to add the dechlorinator as the tap water flows into your tank. Pour in the direction of the flow so that the dechlorination process becomes faster.
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