Dear Cees, the higher ...

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Dear Cees, the higher surface area of the new media means that you also have reduced channel sizes. Smaller channel sizes mean a higher risk of clogging. 

However there are different ways to still reduce the risk of clogging: 

1. Choice of the right fill media design and considering a mix of different fill media types depending on the layer depth. 

2. Correct operation of the rotary distributor and more frequently flushing. 

3. Biofilm thickness monitoring e.g. with weight stations 

More information on trickling filters can also be found here: Trickling filter video