Our Sitewide Links-Filter is a filter that removes huge numbers of links from a certain domain to now skew results.
This means if you have a site-wide link from a domain from e.g. 1000 sub-pages, and the site-wide filter is set to 5 by default that means that 995 of those subpage-links will be removed from the report.
By this we manage to present better statistics on link metrics, because a link from 1000 sub-pages simply doesn't equate 1000 links, but rather one and a bit. By showing and calculating the strongest 5 sub-pages for such site-wide links we already overweight them, but not to the extend as you find it in other tools where every single sub-page link is counted.
The sitewide link filter thereby results in lower absolute link counts as compared to other tools or e.g. huge link list uploads.
This reduction in links is your advantage as you see a more realistic picture of your backlink profile, but in tools like QBL and BLP this filter can be disabled (at the cost of longer processing and sometimes heavily skewed statistics).
In Link Detox this filter cannot be disabled, as it would hurt some of the detox rules.