The Nu-Calgon 4120-90 Alka-Brite Plus 4x Concentrate Coil Cleaner is a non-acid, alkaline-based product for brightening and cleaning air-cooled condensers. It contains the best available detergents and surfactants to quickly penetrate and remove greasy soils and oxidation and its foaming helps lift greasy soils out of the coil, leaving equipment clean and bright. For cleaning and brightening air cooled condensers, permanent filters and other finned heating and cooling coils. It is not recommended for indoor use and it should not be used on evaporator coils. Alka-Brite Plus 4X is a new concentrate version available in a ready-to-use quart bottle. One concentrate quart equals one gallon traditional Alka-Brite Plus (at 4:1 dilution use). Alka-Brite Plus 4X takes less space on truck, is easy to carry on roofs, and has cleaner connecting – no more pouring or spilling. The specially developed packaging has a dilution insert assembly; simply use what is needed, cap bottle and use for another job. The product ships as a limited quantity – easier to get to the job site. Alka-Brite Plus 4X requires the Clean Connect Sprayer. THE NU-CALGON 4120-90 ALKA-BRITE PLUS 4X CONCENTRATE COIL CLEANER IS FOR PROFESSIONAL USE AND SHOULD ONLY BE USED IN ACCORDANCE WITH ALL REGULATIONS AND PROPER SERVICE PRACTICES. PLEASE SEE PRODUCT LABEL OR CONTACT NU-CALGON DIRECTLY FOR USE INSTRUCTION. IT IS RECOMMENDED TO UTILIZE THE APPROPRIETE PPE (PERSONAL PROTECTIVE EQUIPMENT) DURING APPLICATION.