Filters of search engines are created for fight against low-quality Internet resources. Filters are imposed on the websites in the automatic mode, and it leads to the fact that sometimes the qualitative websites appear under the filter too.
Filters of search engines are implementation of the penalties applied to the websites for any violations. However there are cases when the owner of the website is sure that he did not use the prohibited methods of optimization and did not place nonunique content, and at the website for the unclear reasons the attendance fell. In this case it is necessary to check the website for filters to try to understand the reason of problems.
Check on the most dangerous filters of Yandex
The most dangerous filter of Yandex is AGS which is imposed on the websites containing low-quality and nonunique content. At the same time the AGS automatic filter evaluates the website in several dozen parameters. To check the website for AGS, it is enough to look at what number of pages of the website is in the index of the search engine. Usually after imposing of this filter in the index there will be no more than 15 pages, but most often there is only one homepage.
It is possible to check the number of pages in a personal account of Yandex webmaster, after registration of the account and confirmation of the rights for the website. If you have no account on Yandex, then it is possible to use xtool service, it not only will show the number of the indexed pages, but also will check your website for AGS.
Among webmasters the redirect filter is not less known. His insidiousness is that the domain of the website gets under the ban. And if in a case with AGS in the index there is at least a homepage of the website, then in a case about a redirect filter the website completely is removed from the index of the search engine. However this filter only on the websites having Java scripts of redirects on third-party resources is imposed.
To check the website for a redirect filter, it is necessary to enter a command into the search string of Yandex "site: mysite.ru", a command is entered without quotes, and will be replaced with "mysite.ru" with a domain name of your website. As a result you receive the list of the indexed pages. And if the website is not banned, then in the list there will be at least one page.
Check on filters of Google
The Google search engine has similar filters. For example, the Panda filter on the action is an analog of AGS. Check of the website on this filter is carried out just as in Yandex. It is necessary to insert a command into the search string of Google "site: mysite.ru". Look how many pages will be in the index if several times there is less real quantity or only one, then it is for certain the Panda filter. If in the index there is no page, then the website is banned (provided that earlier it was indexed).