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Your cart is empty.4.7 out of 5 stars
Slim Filter Bio-Clear replacement cartridge fits all 3 Slim Filter Models. Ideal for goldfish, it combines zeolite and Ceramitek in 1 cartridge for a healthy aquarium. The zeolite effectively adsorbs toxic ammonia and reduces stress on fish, while the Ceramitek, a highly porous ceramic biological filter medium optimizes biological filtration. The easy to use disposable cartridge should be replaced every two weeks. (Never replace all filter cartridges at the same time in order to ensure constant presence of beneficial bacteria.)
Krystle
Reviewed in the United States on February 19, 2025
Great quality. Keeps water clear.
Krystle
Reviewed in the United States on February 19, 2025
Great quality. Keeps water clear.
Junior Zambrano
Reviewed in Spain on January 24, 2025
Muy buen producto era lo que buscaba, medida perfecta para mi filtro S15
Junior Zambrano
Reviewed in Spain on January 24, 2025
Muy buen producto era lo que buscaba, medida perfecta para mi filtro S15
Martin A
Reviewed in the United States on January 17, 2025
The media could not be loaded.
Martin A
Reviewed in the United States on January 17, 2025
The media could not be loaded.
girly girl
Reviewed in the United Kingdom on June 27, 2024
Couldn’t get these in any store for my generic hang on back from Amazon so happy when I found them, I just kept reordering over & over. Size was perfect. Water quality almost immediately improved & they were so cheap in comparison to other hang on back filters. Durable, long lasting & easy to clean until end of life was near. Easy to use also: take out of packet and rinse then insert. Sadly I have those fish away & retired the tank & filter but it was a good ride. The HOB & filter media’s gave me a good service. Defo recommend these.
girly girl
Reviewed in the United Kingdom on June 27, 2024
Couldn’t get these in any store for my generic hang on back from Amazon so happy when I found them, I just kept reordering over & over. Size was perfect. Water quality almost immediately improved & they were so cheap in comparison to other hang on back filters. Durable, long lasting & easy to clean until end of life was near. Easy to use also: take out of packet and rinse then insert. Sadly I have those fish away & retired the tank & filter but it was a good ride. The HOB & filter media’s gave me a good service. Defo recommend these.
Jordan
Reviewed in France on September 14, 2023
… adaptés pour poissons rouges mais pas d’aussi bonne qualité que les spéciaux poissons rouges, ils se salissent plus vite et il faut donc les changer plus régulièrement.
Jordan
Reviewed in France on September 14, 2023
… adaptés pour poissons rouges mais pas d’aussi bonne qualité que les spéciaux poissons rouges, ils se salissent plus vite et il faut donc les changer plus régulièrement.
John Martin
Reviewed in the United States on May 17, 2023
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
John Martin
Reviewed in the United States on May 17, 2023
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
Cliente
Reviewed in Italy on March 7, 2023
Filtrano l'acqua in modo adeguato ed elimina i cattivi odori.
Cliente
Reviewed in Italy on March 7, 2023
Filtrano l'acqua in modo adeguato ed elimina i cattivi odori.
canon on the hip
Reviewed in the United States on February 10, 2023
These filters are keeping my small tank clear. They are reasonably priced. They can be rinsed a few times and still continue quality filtering. Have ordered twice and ready to order again.
Shane Love
Reviewed in the United States on February 10, 2023
I have a Marina S10 filter on my 6.5 gallon Betta tank. Great filter and these cartridges are easy to replace and work well.
canon on the hip
Reviewed in the United States on February 10, 2023
These filters are keeping my small tank clear. They are reasonably priced. They can be rinsed a few times and still continue quality filtering. Have ordered twice and ready to order again.
Shane Love
Reviewed in the United States on February 10, 2023
I have a Marina S10 filter on my 6.5 gallon Betta tank. Great filter and these cartridges are easy to replace and work well.
Klaus Von Beaverhausen
Reviewed in the United States on February 29, 2020
I love these because they are easy to change and of all the cartridge type filters I’ve used seem to be the best made. I alternate changing one side each week in an s10 model. They are also really cheap like what 75 cents per cartridge, I spend 5 times that daily on coffee lol. As usual with amazons weird pricing at the time of this review, they are cheaper the less you buy so I Just buy 10 3 packs for 23$ rather than one 18 pack for 27$. Unless I’m missing something and it’s 18 3 packs. You never know with amazons awful descriptions but I’m not going to risk it because it probably is just 18 cartridges.
Klaus Von Beaverhausen
Reviewed in the United States on February 29, 2020
I love these because they are easy to change and of all the cartridge type filters I’ve used seem to be the best made. I alternate changing one side each week in an s10 model. They are also really cheap like what 75 cents per cartridge, I spend 5 times that daily on coffee lol. As usual with amazons weird pricing at the time of this review, they are cheaper the less you buy so I Just buy 10 3 packs for 23$ rather than one 18 pack for 27$. Unless I’m missing something and it’s 18 3 packs. You never know with amazons awful descriptions but I’m not going to risk it because it probably is just 18 cartridges.
dolphinjen14
Reviewed in the United States on February 17, 2017
Loved these. They work very well. In the small aquariums it's easy to overload while cycling. After 3 weeks of cycling the ammonia was down to zero, the nitrites weer decreasing and the nitrates were still above 60ppm. We added these to assist in the last leveling stage until the nitrates dropped to more acceptable levels. We have chosen to continue to use these as a safeguard with a 10 gallon aquarium. The small aquariums have less room for toxic levels to change without heavily effecting our fish health. Our fish are healthier and we worry less about sudden changes we may miss between regular water changes and testing.
dolphinjen14
Reviewed in the United States on February 17, 2017
Loved these. They work very well. In the small aquariums it's easy to overload while cycling. After 3 weeks of cycling the ammonia was down to zero, the nitrites weer decreasing and the nitrates were still above 60ppm. We added these to assist in the last leveling stage until the nitrates dropped to more acceptable levels. We have chosen to continue to use these as a safeguard with a 10 gallon aquarium. The small aquariums have less room for toxic levels to change without heavily effecting our fish health. Our fish are healthier and we worry less about sudden changes we may miss between regular water changes and testing.
G. Remrow
Reviewed in Germany on February 18, 2016
Ich verwende die Bio-Carb zusammen mit Bio-Clear in einem Marina S20 Außenfilter, über die Ansaugöffnung im Becken habe ich einen Fluval Vorfilter Größe 1 gesteckt, damit nicht immer Garnelen angesagt werden oder Schnecken die Pumpe blockieren. So funktioniert die Wasserreinigung recht zufriedenstellend und unkompliziert - ich hoffe nur, die Filter für das Marina-Außenfilterprogramm sind noch lange erhältlich und werden nicht aus purem Übermut (wir sind Hagen! oder so ähnlich) eingestellt.
G. Remrow
Reviewed in Germany on February 18, 2016
Ich verwende die Bio-Carb zusammen mit Bio-Clear in einem Marina S20 Außenfilter, über die Ansaugöffnung im Becken habe ich einen Fluval Vorfilter Größe 1 gesteckt, damit nicht immer Garnelen angesagt werden oder Schnecken die Pumpe blockieren. So funktioniert die Wasserreinigung recht zufriedenstellend und unkompliziert - ich hoffe nur, die Filter für das Marina-Außenfilterprogramm sind noch lange erhältlich und werden nicht aus purem Übermut (wir sind Hagen! oder so ähnlich) eingestellt.
JL
Reviewed in the United States on December 14, 2013
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!
JL
Reviewed in the United States on December 14, 2013
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!
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