Surface / Air 500 can facilitate jobs of all sizes by serving wide area applications when used with Cool Mist Humidifiers, Electrostatic Sprayers, ULV (Ultra-Low Volume) Sprayers, and High-Power sprayers. This convenient, residue-free concentrate provides flexibility for immediate use or can be diluted to suit your needs. Dilution Light Strength: 1 part cleaner to 2 parts water (1:2) Medium Strength: 1 part cleaner to 1 part water (1:1) Heavy Strength: Ready to use Do not dilute with alkaline water