the 60 is Water the 40 is Chem for shingle
BUT for tile
the 60 is chem and the 40 is water
I think it would be 7.5% if it was 60% chlorine and 5% if it was 40% chlorine,
but i could be wrong
I didn't understand you.. sorry:sad: what is 7.5%, what is 5%?
Per my calculations if the mix is 40% bleach with 12.5%, then it should be 48% with 10.5% bleach. How I am going to measure these 48% for my 35gal tank, I have no idea ...
"72 gallons of chlorine to 36 gallons of water"
How do you get 108 gallons in a 100 gallon tank?
Just mix 24 gallons of 10.5% to 11 gallons of water for your 35 gallon tank it will be fine.
(close enough Johnson has it figured out)
People, you are thinking way too much and making this into something that it is not.
Keep it simple, 1/2 bleach and 1/2 water then if the mix is not strong enough, put more bleach. If it is strong, try adding more water.
Until you know how your roofs clean (comes with lots of roof cleaning and experience) keep it simple and maybe a little more water than bleach and you should be fine. If it does not work too fast, like within 10-20 minutes then you need more bleach.
This stuff can easily escalade into a large argument or fight over nonsense, keep it simple.
As for the soap, 28 to 32 ounces of dawn or other soap into a 50 gallon tank mix.
Keep it simple.
I want to leave some space for Borax or some soap for less run off. I am still new to the roof cleaning. I scheduled a job on 3000sq ft. house (tile), so I figure 2 tanks of 30-35 gal mix should be enough. What do you guys think?