The clogging of bio media is ...

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The clogging of bio media is depending on theporosity of media and organic loading rate BOD g/m2d. Prem is right if you had used a rock as media before and has replaced by a plastic media. However, if the previous media were a plastic media, there would be an increased risk of clogging. Because with an increased specific area of plastic media, normally the porosity would be reduced! So please check your organic loading rate and porosity to make sure there is no risk.