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Sure but once you add chemicals- depending on just what, now you have an animal of a different color and that may trigger an EPA issue or violation.

Ralph what is the post treatment you apply? I hear some percentage of bleach being used by some folks, however, that can be a potential EPA fine ($ubstantial) if it's running off the property and into the wastewater street drains.

Isn't there a concern, an EPA issue with bleach running off and into sewer or the drainage system in residential neighborhoods?

Hey George, I'm a part time guy doing strictly driveways/sidewalks/patios in NC and running a Simpson 4200psi/4gpm and just upgraded the surface cleaner to a 20" Hammerhead. I watched a couple of your vids and had a couple of ?'s for you- What do you use for pre treatment? I use Krudkutter's...