(6pk) Aqua-Tech EZ-Change Aquarium Filter Cartridge

My filter system is a aquatec 30-60. When you buy the filters of the same brand you can be assured that they will fit properly and that they will properly filter your aquarium water. The problem with comparable products from my experience is they seem to have some sort of little quirk that causes them to not do the same job as a brand name. The filters in my aquarium are good for about a month before I have to change them, alot of this is going to depend on how many fish you have and how much you feed them. I always purchase a 6 pack of filters so they are on hand when it is time to change them and reorder when I use the last filters in the package. I am not going to kid you as you can if you want get them for a little less money from a big box store. I myself buy alot of items from amazon, Why? Because sometimes it is cheaper and there are other times when a item is a little bit more. But stop and think about it by the time you figure in your gas and time interacting with the big box store you are paying close to the same price, lets face it gas is not cheeap these days and your time has become a commodity. You also need to remember there are several different delivery options available to needing the item right away or in a few days which usually results in free shipping. I am satisfied with the product and the job it does, the cost is usually competative when I figure in the aforementioned factors and I am always ready for the next filter change.