Why use the Mezzo valve? 

The Mezzo “Toro” Dual lance wash system was made specifically for two-step (sometimes called two-stage or twin chem) wash applications. The truest form of a touchless wash occurs when you use a low pH to with a high pH wash solution to shock the road grime and dirt.

Step 1 the low pH solution will break through the ionic bond releasing contaminates and restore the shine to your clear coat and metallic finishes. In stage 2 the high pH will seal and protect your exterior finish and neutralize the solution applied in step 1. Two-step wash systems are popular in fleet washing and most commonly found in most drive-thru car washes where an acidic and caustic solution are both used by many self-serve and gas station touchless washes.