In SEO people spent years talking about “Google filters” – Panda, Penguin, the “sandbox”, the supplemental index. Most of these terms appeared 8–10 years ago and were used to describe the effects of specific algorithms and updates. Today Google speaks a different language: ranking systems, spam policies and manual actions.

For a site owner, however, the core reality has not changed: if you break the rules, your visibility drops. In this article we’ll look at how to understand that your site has been hit by sanctions, how to confirm it using Google’s tools and what to do to recover your organic traffic .

What “Google filters” mean in modern SEO

Google no longer talks about standalone filters in its public communication. Instead, it uses concepts such as:

  • automatic ranking systems – algorithms that evaluate content, links, page usefulness and user behaviour;
  • spam-fighting systems – automatic mechanisms that reduce the visibility of pages violating Google’s spam policies ;
  • manual actions – penalties applied by Google reviewers to sites that seriously violate the rules. You can check their status in the Manual Actions Report in Search Console .

The term “filters” survives mostly in SEO slang, but in practice we are dealing either with algorithmic demotion or with manual actions.

Typical signs that your site is under sanctions

No tool will show you a big button saying “Your site is under a filter”. But there is a set of common symptoms:

  • a sharp drop in organic traffic without serious technical changes on the site;
  • ranking losses across a wide range of queries, including branded ones;
  • disappearance of part of your pages from search results or a sudden decrease in the number of indexed URLs;
  • loss of visibility shortly after a new spam update from Google;
  • notifications about manual actions in Search Console.

If you see several of these signals at once, it’s a clear reason to audit the site more deeply.

Step 1. Check for manual actions in Google Search Console

The first step is obvious – check whether Google has explicitly warned you:

  1. Log in to Google Search Console and select the relevant property.
  2. Go to “Security & Manual Actions” → “Manual actions”.
  3. If you see no messages there – there are no manual actions at the moment. If there are, Google will show the type of violation and example URLs.

In case of manual actions, the goal is not to look for “workarounds”, but to fix the underlying problem: remove spammy pages, clean up manipulative links, close toxic sections, and so on. After the fixes you submit a reconsideration request.

Step 2. Analyse indexing and technical health

Next you should make sure that your issues are not purely technical or indexing-related:

  • check the “Pages” (Page indexing) report in Search Console – look for sharp drops in the number of indexed URLs;
  • make sure important pages are not blocked in robots.txt or via noindex;
  • check HTTP status codes (200 / 404 / 5xx) for key sections;
  • review your sitemap (sitemap.xml) – ensure there are no outdated, duplicate or purely technical URLs listed.

The old idea of a separate “supplemental index” is now outdated. Instead, Google explains much more clearly why a specific page is not being indexed.

Step 3. Analyse traffic and queries

To understand the nature of the problem, it’s important to look at your data from several angles:

  • in Google Analytics 4, review the dynamics of organic traffic and correlate drops with known algorithm update dates;
  • in Search Console, use the “Search results” report to see which queries and pages lost the most impressions and clicks;
  • pay attention to long-tail behaviour – sometimes the site still ranks for low-frequency queries , but almost disappears for more competitive keywords.

This analysis helps you understand where exactly Google has “reduced trust”: for the whole domain, a specific section, or a certain type of page.

Main reasons for sanctions: content, links, manipulation

Low-quality, thin or copied content

Algorithms like Panda were historically aimed at weak content – pages with no real value, copy-pasted texts, mass auto-generated articles. Today those principles are deeply integrated into Google’s core ranking systems, which evaluate usefulness and expertise.

The risk grows if your site has:

  • many pages with very short texts that don’t really answer the user’s query;
  • extensive use of machine translation without human editing;
  • large blocks of copied content from other sites without adding any extra value;
  • heavy keyword repetition in body text and meta tags.

Manipulative links and link schemes

Penguin used to be a separate filter against link spam, and its logic is now part of the core algorithm. Sites can lose visibility because of:

  • mass buying of links from non-relevant or obviously spammy sites;
  • PBNs or satellite networks created solely to pump link equity;
  • mass posting of comments, profiles or directory entries just for the sake of a backlink;
  • over-optimised anchor texts with hard commercial keywords.

Today Google often doesn’t “punish” bad links, it simply ignores them. But if your link profile clearly violates the policies, manual actions are still possible.

Aggressive over-optimization and technical manipulation

Beyond content and links, the following tactics also create risk:

  • cloaking – showing different content to users and search bots;
  • doorway pages – URLs created solely to funnel traffic elsewhere;
  • hidden text or links, concealed with styles or scripts;
  • mass creation of auto-generated pages that bring no real value to users.

All of this clearly falls under Google’s spam policies and increases the chance of sanctions.

What about the historical “filters”: Sandbox, supplemental index, “-30”, Panda, Penguin?

Older SEO articles frequently mention specific “filters” and even refer to “minus 30 positions” as a separate penalty. Today it’s more helpful to treat these as historical labels the community used to describe outcomes – not as official modes inside Google.

  • “Sandbox” – a loose term for the state of new or weak sites that haven’t yet earned enough trust. In practice this means poor rankings on competitive queries, while the site may slowly grow on easier ones.
  • “Supplemental results” – an old way of describing pages that were technically indexed but almost never shown. Now Google explains non-indexing reasons directly in Search Console.
  • “-30” – a noticeable ranking drop due to obvious violations. Today this is usually the result of spammy practices or manual actions.
  • Panda and Penguin – historical names of major algorithms whose logic is now part of Google’s core ranking systems.

The key idea: the label is not important. What matters is understanding why Google has lost trust in the site.

Practical checklist: how to check a site for Google “filters”

  1. Check for manual actions in the “Manual actions” section of Google Search Console.
  2. Review indexing in the “Pages” report and via site: operators in search.
  3. Look at traffic dynamics in Google Analytics 4 and correlate drops with known update dates.
  4. Analyse your link profile via Search Console and third-party tools: identify obvious spam and purchased links.
  5. Audit your content – uniqueness, usefulness, topical depth and alignment with search intent.
  6. Check technical health – speed, mobile friendliness, absence of cloaking and hidden spam.
  7. Create a recovery plan – what to delete, what to rewrite, what to deindex and which links to clean up.

How to recover from sanctions and reduce future risk

In most cases, recovering rankings is not about tricks – it’s about systematic work:

  • remove obviously spammy or duplicate pages;
  • rewrite weak content, adding real expertise, examples, data and clear answers;
  • tone down aggressive over-optimization in on-page text and metadata;
  • gradually clean up the link profile and move away from artificial schemes and networks;
  • focus on brand, expert content and long-term channels instead of “quick hacks”.

Google is becoming more demanding about quality and honesty. Sites that invest in content, expertise and real user value not only recover more easily from sanctions, but also enjoy more stable long-term organic growth.