These are Aqueon 10-gallon QuietFlow, mini internal filter cartridges. These filters are great for getting crystal clear water in your Krabitat. I've had other filters that just couldn't handle the mess my 5 fiddler crabs had, the water was always yellowish. Not since I changed and installed the filters has the water in the aquarium become crystal clear, like spring water. They're a bit pricey, but you can pull the line out and swish it around in the aquarium water and it will be like new. I also add fresh charcoal before assembly. As always, Aqueon has another exceptional product.
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