Tech Specs Compatible with the: Hallett 500 Series, Hallett 750 Series, Hallett 1000 Series Reviews There are no reviews yet. Be the first to review “UV Pure Air Filter – GD7” Cancel replyYour email address will not be published. Required fields are marked *Your rating * Rate… Perfect Good Average Not that bad Very poor Your review *Name * Email * Save my name, email, and website in this browser for the next time I comment.