Is the "filter" icon widely recognised by users?

Note: I'm NOT asking for an icon suggestion.

I'm designing an online menu for users to order their food at a restaurant. I'm also including a filter so that they can apply their dietary preferences. For the icon, I've used the filter.

My question is if using this popular icon widely recognized enough to be clear for users to be able to understand it without including a label. How can I find out given the audience for this restaurant are from a wide range of nationalities. I'm more concerned about users who are not tech savvy.