A disadvantage with other biofilm processes is that they experience bioclogging and build-up of headloss. Depending on the type of waste and design of the process, several problems can occur during the full-scale process. Some of the disadvantages are:
* Feed pipe/effluent sieve blocking
* Nonhomogeneous mixing
* Carrier voids blocking
* Destroyed carriers
* Carriers accumulating at the effluent sieves
* Carrier overflow