These are so pleasant. I almost want to give them four stars. But it's not fair. The reason for this is that since I bought them I have decided to put some live anubias aquatic plants in my 5 gallon Marineland tank. Because these cartridges contain charcoal, they can neutralize the plant fertilizers I add to the water. But it would be wrong of me to deduct a star just because I decided to change my setup. I just cut a two inch slit in this thread and remove the charcoal. I also filled these filters with a little extra pond string for extra filtering power. When I'm done with this cartridge pack, I'll probably stick with pond filter floss. But if I didn't want live aquatic plants I would buy this product again and again. It holds crystal clear water well. I wash every week and change once a month.
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