Whisper® Bio-Bag® Replacement Cartridges

Product No. 25900-01

For the ultimate in convenience, choose Assembled Whisper® Bio-Bag® Cartridges. Packages are color-coded, making it easier than ever to remember which size to purchase.

Small-3i Internal
Medium- PF10 Power Filter, 10i Internal and Reptofilter 90 GPH
Large- 20, 30,40 and 60 Power Filters and 20i & 40i Internals






1. Rinse Bio-Bag• under cool tap water to remove carbon dust.
2. Open lid and insert Bio-Bag into filter.
3. Replace clogged Bio-Bag when there is reduced water flow out of the filter.

For best results, change Bio-Bag monthly or sooner, if required.

Rated 2 out of 5 by from This product is sometimes good sometimes bad I often buy these filters and have had a fairly good experience.I recently bought some filter cartridges and some of them were broken. I was upset because these filters are expensive and I don't want to have to spend more money and get more broken filter cartridges.
Date published: 2015-12-12
Rated 5 out of 5 by from This product preforms well The filters do the job in clearing the water. Water is cleaned
Date published: 2015-08-07
Rated 4 out of 5 by from I ordered the wrong size.... High quality filters but I wish the dimensions were listed so I could have ensured the right fit the first time. I guessed small but they were too small. I will be ordering the next larger size. I looked for a model number on my unit but couldn't find one. Luckily this was for a 5 gallon tank with a singe Betta so he wasn't too upset.
Date published: 2015-04-25
Rated 5 out of 5 by from does really good job of keeping my fighting fish tank clean the products do there job and I intend on buying more tanks with filters for my other two fighting fish from company
Date published: 2015-01-07
Rated 5 out of 5 by from Whisper Bio-bags are so convenient. I have been using Whisper bio-bag filters with my fish tank for the last 20 years and find their ease for changing so easy. You can easily see when they need to be replaced.
Date published: 2014-11-28
Rated 5 out of 5 by from Filters are size required for filtration unit. Very fast delivery. Filters are as described in ad and received in good condition.
Date published: 2014-06-26
Rated 5 out of 5 by from tetra love biofilters and the fish food from tetra, The bio filters are easy to use and the filters work great
Date published: 2013-01-15
Rated 1 out of 5 by from Deteriorate around a month These products work ok for the smaller filters but when used in a real filter like the Tetratec 500 they literally deteriorate and fall apart around 1 month. Extremely expensive when using 4 of them and you have to replace them in like 2 weeks or they break down in your tank. Added 4 new ones and went to replace the carbon a month later and they fell apart as I pulled them from my Tetratec filter releasing all of the waste they captured back into the tank. I would not recommend these products ever.
Date published: 2012-04-02
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