In truth, this is not a “bombing” case, but a standard situation in SEO and its usual solution. Of these situations is the bulk of the work. In this case, the article will be of interest to owners of online stores.

Client site at one moment lost much in positions. As a result - less traffic and calls. A story about a typical problem and its solution.
Stage 1 - Problem Identification
1. We reveal the sagging semantics cluster. In fact, it was immediately clear that the most basic inquiries had sunk: “buy car trailers”, “car trailer”, etc.
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2. We study page optimization. We see an obvious pinch of keywords. And not in the texts, but in the functional blocks of the site (a frequent mistake of the owners of online stores). For example, the frequent occurrence of keywords was in the filter (towbars, trailers, etc.).
3. On the product page was a block "similar products". He was absolutely not needed, in the context of choosing a trailer. But he added spam.
4. On the pages of articles stood pass-through (displayed on all pages of articles) block "12 months warranty on light trailers". This is another +1 key "light trailers" on each page of the site.

5. In the header of the site there were several links to manufacturers.

Pretty aggressive, "through" perelinkovka.
Conclusion - a clear re-spam keywords, the presence of unnecessary relink.
Stage 2 - problem solving
We form tasks:
- Disable all filters from the left column. The site has a total of 30 trailers. Such a large filter has nothing. An alternative solution to this problem is to put a filter in the noindex tag. Then the search engines will not see it;
- Instead of links in the header - write the type of activity - "light trailers and accessories";
- Turn off the block "similar products";
- We remove key entries from pass-through blocks in articles.
Stage 3 - result monitoring, adjustment
The overall result is this (screenshot topvisor.ru). Every month we observed changes in a positive way. In the end, the position managed to return.


Taken into the TOP such requests as "trailers for passenger cars", "passenger trailers", "trailer for the car", "buy a trailer", etc.
General conclusion
Here I have tried to reflect on how work with SEO is going. There are 15 such tasks per day. Each has its own characteristics.
For owners of online stores - note that elementary blocks of filters or “cross-cutting” links can seriously affect the position for the worse. Here are some simple recommendations:
1. Check if your blocks are closed with the product (on the category pages) in noindex. This can be done using the RDS bar (http://www.recipdonor.com/bar).

Blocks closed from indexing will be displayed as follows:

2. Pay attention to the "pass-through" blocks with links. If such is present - know, the link (text or image) is on ALL pages of the site. And this is an extremely aggressive re-linking. I recommend to avoid this.
3. If the site sags make an analysis in 3 steps (for those who do not have this family. Kernel):
A) Identify a common cluster of dropped queries. There may be several. Suppose sagged inquiries "buy a passenger trailer", "passenger trailer Moscow", "passenger trailer price", "headlights for trailer Moscow", "lantern for trailer", "chain trailer", "trailers for car price", "trailers Moscow"
B) Form the table:

C) We determine the relevant page of each cluster.
Cars trailers -
site.ru / product-categoryAccessories -
site / product-category / aksessuary-i-zapasnye-chastiAnd now we are looking at what is happening with these pages.
- Check the text with advego.com/text/seo or content-watch.ru ;
- Look at the layout of the text. Pictures, lists, titles - all this should be present;
- Read the text. If by itself it is crooked, not informative, and contains more water, correct it;
- Do not forget about the number of internal links (inbound and outbound). They should not be inadequately many. In the text itself, place no more than 2;
- Check if there is a page in the index of Yandex. For this, there is a tool in the webmaster's panel:

We hope the article was useful for you, thank you for your attention.