Top Fin EF-S Element Filter Cartridge Value Pack 12 Month Supply 2.1 in X 3.7 in

I like the way these filter, filter out the junk that doesnt go back into the water.

We have 3 fish in three tanks. For each tank, we go through these filters about one every six weeks. They really keep the water clean. Be sure to thoroughly rinse the filter BEFORE putting it in the tank as there is carbon dust that you need to wash off. They work as advertised.

They’re worthy for the price

Lasts a month or so

I have one betta in a 3.5 gallon tank. My filter takes two cartridge and I change them out at every cleaning, which is about every 4 weeks. The filters hold up well and actually dont look that soiled at 4 weeks but I change them anyway. I purchased my first box of these back in June 2021 and now on my reorder received the same product.

Ok - everyone needs these if you have that kind of filter so buying them in this bigger pack has saved me almost $20 last month buying them individually at the pet store.

Easy, no problem

Did not work at all with our fishtank that came with possibly a different sized (but equally named filter).

Fine product. Wish amazon didnt run a forklift over it before they sent it to me.

I have a 3 gallon beta fish tank. My water had been fine with the filters from the pet store, but I ran out so I ordered these online. Within a week, my water was green. I thought it was a fluke, so I cleaned the whole tank and replaced with a new filter and now, about 10 days later, the tank is green again!!