As Raphael says (hi, ex-colleague!).
Personally I don’t believe in filters, even if just because my IT level is such that a filter would merely be a minor inconvenience to get around, but a major inconvenience in that it would trouble me all day. I’m not a baby and I don’t need a babysitter.
I grew up in The Netherlands. There, one can take a train to Amsterdam, walk a bit to the left and see the most horrible things. Yet I would never go there. The internet is just the same. All you need is self control. Be a normal responsible adult, that’s all.