Professional Grade Safe-T-Plus® Plant & Concrete Care Formula Windsor® Safe-T-Plus® is a premium ice melt that contains a sealing agent to help minimize concrete damage and compounds that promote plant growth, making it safer for concrete and plants than plain salt. Available in 20kg bag. Related Products Safe-T-Salt®Ice Melters. Safe-T-Plus®Ice Melters. Safe-T-Pet™Ice Melters. Ice Melter Blend with Blue CrystalsIce Melters.