The water flows from the bottom up through your filtration system. To optimize efficiency:
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Place the soft, more open side of the FilterFirst pad down against the sponge.
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Follow with the polishing pads, ensuring their soft side is also facing down.
This layering method is designed to improve both water clarity and quality.
Pro Tip for Goldfish Owners: Since goldfish tend to produce more waste than tropical fish, you may need to rinse or replace the pads more frequently to maintain optimal performance.