tank size for roof cleaning

We have had houses here use 150 gallons at a clip

that sounds like a lot of roof mix. that cant be for an asphalt roof, is it?
 
I had one day before yesterday that we used 125 gallons on it was 4200 square foot plus a shop and a 3 car garage ..... probably 5500 total
is that the sq ft of house & garage or just the roof?
 
where can i order 30 gallon tanks from, i cant find them anywhere. only 50 and better.
 
Absolutely. 2- 60gal tanks can make 150gal @ 40%. 2 tanks can give you the option to mix on sight to the specific maturity of the algae.

my truck doesn't have enough room for two 60 gallon tanks im definitely going to have to go smaller.:(
 
I've never seen any specifically for tanks just metal straps or u shaped steel pipe. For a 30 gallon tank I'm sure regular cargo straps will be just fine. like these. http://www.northerntool.com/webapp/wcs/stores/servlet/product_6970_200333961_200333961

im really going to have to think about how to set this up. im thinking two 30 gallon tanks & delevan pump & also ill have to find a decent hose. the winter is coming so i will have plenty of time to figure it out.
 
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