What you buy ready to use is .5% so that is what I try to mix up. For a gallon, you want .64oz of full strength (128*.005). My concentrate is 36%, so I would use 1.7oz of the concentrate to the gallon (.64/.36). So, 2oz of 36% concentrate in a gallon of water will get you a little stronger than the .05%. If you have a different concentrate, just substitute the % concentrate in the above formula where I have .36. If you want a quart, use 32 instead of 128 in the formula.

Six ounces?!! Directions I found for livestock says 8 ounces to 6 gallons of water? You say 6 ounces to one gallon?

Difference is you're putting it on a cow. For humans you're just soaking or applying to clothing and letting dry

If you had your own answer, why even ask? If you do what I said, you will have exactly the ratio you buy buy in the "ready to use" spray bottles from Sawyer. But, it is obvious you are going to do something different anyway.

Didnâ€™t find the directions until yesterday thats why. Still seems strong to me. 6 ounces to a gallon.