I agree in that the inlet does get very cruddy as does the cup so I do the inlet about once a month and the cup when it gets half ull (about every 9-10 days or so). Mine takes a day or so and then it starts foaming over the top again (this is on my 58 full reef tank). I do like this skimmer, for the money I think it is great. I do like hang on stuff and that limits me a bit more then you members who are into sumps and the like.