I've been reading various threads on the new Google 30-day sandbox filter and I've noticed that there's a lot of confusion and misconceptions regarding the sandbox that I'd like to debunk. 1. New sites don't automatically get sandboxed after a few days unless you build links too fast. The anchor text doesn't seem to matter in my tests. As long as you acquire too many backlinks within a short period of time, the sandbox awaits you. 2. The sandbox or 30-day waiting period seems to be a filter applied to the backlinks to a site or domain, not the domain itself. I've undergone this 30 day waiting period on aged domains as well, so it's definitely the age of backlinks that matter, not the age of the domain. I believe that after the backlinks have reached a certain age, the filter disappears and link juice flows to the site which then causes a big jump in rankings. Lastly, the sandbox has existed before the May update and it lasts even longer than 30 days. Perhaps this blog post from Hayden at No Hat SEO entitled "Sandboxing of New Sites ? SERP Auditions?" will help you understand what I'm saying better. Just do a Google search for it. What do you think?