Bio balls are small, pegged plastic balls mainly used as the biological media in wet/dry filters.

These little plastic bio balls have lots of surface area for the growth of bacteria for filtration.

They are used as the biological media in salt water and fresh water aquariums as well as ponds.

They are really simple to use: place into a mesh bag and drop into the pond filter.

Do not clean the Bioballs once they are cycled, or you will risk killing off all the beneficial bacteria that you need to filter your water.

Another use for Bioballs: fill your tank's overflow box. They will keep your snails and other animals from going down the overflow as well as quiet the overflow greatly.

These Bioballs are approximately 1" diameter

Bag contains 100 Bioballs

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Klarna's credit products are provided by Klarna Bank AB, which is authorised and regulated by the Swedish Financial Services Authority, with limited supervision by the Financial Conduct Authority. More information can be found here.

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We really want you to be happy with the product that you've received. If however, when the goods arrive they're not what you want, then no problem - we have a 60 day no quibble return guarantee. Just let us know that you're going to return the item(s) by contacting us(stating your Order Number) and complete the returns packing slip that will have been included with your delivery. This will help us to quickly identify the item that you have returned (unopened and unused) - and we'll put a refund through for you.