You haven't mentioned the ...

You haven't mentioned the type of filling material. I guess that you mean that your filter has a plan area of 53 m2, so it is 6m deep, in which case it will be a plastic media. A structured plastic media comprising corrugated layers on a diagonal angle will be much more resistant to clogging than mineral media and I personally believe structured plastic media are more resistant to clogging than random packed media too.

The flushing rate (or Spulkraft number) is also important. You don't mention whether your filter has a rotating distributor or a fixed distribution system, but you may be able to adjust the flushing rate. It is not always easy to predict how the system will respond; you might think that increasing the flushing rate will reduce the risk of clogging but actually it will also reduce the population of higher organisms (flies and snails) living in the filter, which graze on the biofilm and can help to keep it under control. Air temperature has a big effect on trickling filters and you may need to adjust parameters according to the season.

A higher recirculation rate will normally help to reduce clogging (by increasing flushing and by diluting the influent) but of course it will increase operating costs too.