Call me ignorant but what good is it to a PG mag/ Zspray or what have you for the use of appling herbicide? They tout being able to do all this SQ FTdge with very little water. All products I know require at least .5 gal/1000. Seems to me there would be alot of filling/refilling. Example how is the PG Mag going to do 50/1000sqft with only 12 gal. I don't know any product which calls 30 oz/1000? What about drift or vaporization? Just curious?