Nu-Calgon Special Hd Cal Clean, 1 Gallon

We have used this product 50/50 with another product " Foam Brite " for all our commercial, and residential coils for the last 15 years, and it works outstanding, We use pump sprayers to apply, and let sit for about 1 hour, then rinse off . The key is to mix with water as directed, and let the product work before rinsing out. Would recommend rinsing until no dirty water is flowing from bottom of condenser. Great product! NOTE: Remember to always rinse from top to bottom at an angle so not to push debris into coil on the front sides, and same goes for inside, but once the inside of coils are sprayed down, you can then spray horizontally pushing debris out through the coils, and finish with another rinse angled down from top to bottom again on the front sides, always using moderate water pressure so not to damage the coils.