Top Fin4-in-1 Internal Filter Cartridges IF-M (Medium) Refill for IF40 Internal Filter (2 Count)

I have used Top Fin IF-M 4-in-1 Internal Filter Cartridges before they get the job done and they work really well for my 20 gallon Aquarium.Top Fin IF-M 4-in-1 Internal Filter Cartridges make it easy to maintain a clean and healthy aquarium. Count on these easy-to-use items to help support the well-being of your aquatic pets and the beauty of their environment. Only at PetSmart.With ceramic granules, activated carbon, zeolite and filter sponge2-month supply, Includes: 2 CountIntended For: fresh water AquariumsProduct Dimensions: 4.13 in L x 2.3 in W x 0.75 in H (10.4 x 5.84 x 1.9 cmTo help maintain a healthy aquarium, change filter cartridge every 3-4 weeks, or if water flow becomes obstructed. Remove filter cartridge when medicating water as carbon will absorb medications.

Love them. The system works great with these filters. 👍

I have ordered this product a few times and this time I actually had to go to the store for other stuff and found this item cheaper at the store so unfortunately I won’t be buying from the website anymore. Item works great just price stinks.

As far as filter replacement goes, the product as expected and same brand name as in my original IF-40 filter. However, the filter itself labeled 30-40 gallon and I use it in my 20 gallon tank along with 20 gall sponge filter and I think it could do a better job filtering. I change 50-60% of water weekly and only have 14 small fish in that tank and don't overfeed them, plus my tank has lots of live plants that help filtering too.

I been looking for this items on pet stores but they all rent out by the time, I found from Amazon n it's really useful to me

This doesnt hold much. It had to be replaced once a week.

It fit and works great

Went through two packs of these in a matter of weeks, they are supposed to last two weeks. Put this in a 55-gallon tank that also had two other filter systems. These were junked up in just a few days with the other two filtration systems working nonstop. They did nothing for the tank except create a mess to clean. I do not recommend.

Keeps the water very clean

The product is good. I 2 months for the product