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Life cycle of a Bio ball

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Just looking for opinions on how long a Bio Ball lasts b4 the plastic breaks down.

I've heard many different theorys;

Replace a third of them every year

Replace all of them every 3-4 years, etc

My own thought is that there good for at least 5 years

What are your thoughts, experiences :confused:



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Depend on the plastic they are mad of and the amount of light they get.

I have some black and grey Bio Cubes that are over thirty years old and are still as good as the day they went into the sump.

Yet I also have some blue bio balls that are less than 10 years old and are showing signs of wear already.

Still think I will get at least another 10 - 15 years out of them.


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