These cartridges are very easy to use! Just take the old one out and put the new one in. Very little clutter. I keep an old towel nearby to wipe away any water that drips off the cartridge. I use it on my Marina 3 flushing filter/pump and am very happy with it. When changing the water, I change one or two at a time. Make sure the right side is facing the front of your aquarium. It's marked above, but you may have to press a little on the thread to see it. The plastic is embossed with "Side A". My water is clear and the fish seem healthy and happy.
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