Maximize multifaceted filtration area to support biological filtration and help promote the growth of beneficial bacteria. Easy to rinse and clean, they are lightweight Safe for use in fresh or saltwater aquariums, cultures of nitrifying bacteria use in biological filters and gas exchange reactors The hollow structure of the Bio ball will divide the water into a thin stream since there is no resistance when the water flows through. So that it can crush the large pieces of dirt and then make an excellent filtering effect.
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