I assume you're talking about darkydog2002 as it is his filter of 55kg+ that is being brought into question .....

To call his posts about the 55kg+, of which there have been many, as nonsense is doing him an injustice. I use systems that incorporate 55kg+ with much success, it's just a matter of what other filters you put with it.

BTW moeee, darkydog2002 would have got that figure from Malcom Knowles book, and is doing many of us a favour by posting this fact. As I've said you need to know when it's best to use it .....