The modified microfilter is identical to a normal adsl filter except for a sticker on the front which says "Extra Special Filter", saving ISPs huge sums in support costs as a result of the placebo effect on the performance of customers' broadband connections. One such customer with a particularly rubbish broadband connection has reported back to his ISP, "The new filter is magic, the lights on my router now flash much faster and I no longer bash my head against the wall waiting for downloads."
Source: Openreach Engineering Department