Accidents in swimming pools are always undervalued, but, when happen, question are: is there a person for first aid? Are the safety standards respected? Is the structure according to law? After an accurate analysis, the result was that more than 50% of all the accidents depends on slipping on bad quality, not pursuant gratings. For all these reasons, Nexus produces “ad hoc” gratings, the Bicomponent Twin, realized respecting all the security standards.