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If by Bak Pak you are referring to the PR skimmer you will not want to place media in the compartment necessarily. In most cases this can be used in a hang on back filter or in sump for added surface area. In most cases 1 L will be plenty! Feel free to let us know if you have any further questions!
SubstratPro biological filtration spheres developed in the Eheim laboratory with high quality materials.
- Provides surface area for the colonization of bacteria to help purify your reef tank
- Reduces the peak nitrite loads better
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Works great in small places By Alexander on 9/5/2015Alexander would recommend this product to a friendThe product has been around for a while. All tho it seems that many have forgotten about it or that it is not pushed in the spot light as much. It is a tried and true product. I have used it on many tanks and find it hard to want to move away from something I have used and proven it's self. All tho many have moved on/ over looked this product for the marinepure(which works great or better), but if your wanting that extra bio filter in small areas And for a cheaper price, check this product out.