Hi. I am new to this forum. I’d like some advice please. I am only going to be pressure washing my personal home roof. It is approximately 3000sq ft of flat white tile. I have always only used pressure but would like to use some SH for the first time.
My machine is 4400psi / 4gpm. The manual says that the chemical pickup on the machine will put down 1 gallon of chemical for every 10 gallons of water. I’m not sure if my calculation is correct but this is what I’m wondering.
If I fill a 5 gallon bucket with 12% SH, my machine would be putting down 50 gallons of water to use up the solution. That is 1.2% bleach actually reaching the tiles, correct?
If so, is that typically a good strength for removing moderate to heavy dirt/fungus/algae from white concrete tiles?