Marina Bio Clear Ceramic Replacement Cartridge for Slim Filters, 3 Pack – Optimal Filtration for a Healthy Aquarium,White

They work great in the fish tank! Have been ordering these from Amazon for 3 years! Cost is great also!

Great filter for my aquarium - works well at keeping the tank clean

Probably overkill, but I use these in a 2 gallon shrimp cull tank just to give me an edge over potential spikes in toxic substances. It also keeps the water crystal clear.

Definitely no bigger than 20galls .I bought the filter for the wrong reason….I liked the idea of it….slim , unusual , nothing quite like it, four little filters, pump on the inside of the water uptake tube . It works quite nicely. But for a serious filter get the AquaClear

Very easy to use.

Whoever said taking care of fish is easy has never properly cared for one. Caring for fish means weekly maintenance/checks and monthly full cleanings. Of course, this process has been made easier with filters, automatic feeders, and bottled water treatments. When I found this I was extremely happy! I worry less about my fish and am able to regularly maintain their tank. I would recommend this product to those who have a Marina 10-gallon tank, but don't always have the time to go to the pet store. It's convenient and fair-priced. I'm a college student with a Marina 10-gallon tank. I bought the tank at the local pet store almost a year ago, but after a few months they jacked up the prices on filters! My budget was (still is) limited to the leftover money from my paycheck after the bills, groceries and gas, so some days I felt like I couldn't afford paying $8.99 per 3/pack every two to three weeks. This pack was such a life-saver!

I purchase these filters in a regular basis. Easy to install, work great and keep the water clean for 3-4 weeks. Fits perfectly and you have to make sure the writing SIDE A always facing towards you when replacing the filters.

arrived as described, works well with the tank that I need it for