No…Your draw tube will more than likely pull more than 36 oz of “soap” after 4 gallons of DS…most 4gpm machines with normal equipment and 2.1 injector will pull 8 or 9:1…converting 4 gallons to oz is 512oz / 8 = 64oz pulled so 36oz container won’t work.
The best way I’ve found to measure (I know there’s lot of ways but it works for me) is take a clear gallon “soap” container and mark off increments in cups (8 oz) all the way up to 16 cups and fill with water up to 16 cup line.
Drop your draw line in soap container…DS into 5 gallon bucket for 30 seconds. It’s best if your 5 gallon bucket is marked in gallons or even 1/2 gallon increments.
Measure what’s in 5 gallon bucket. Measure how many cups were pulled from soap container. Convert to oz…times by 2 and you have your ratio.
Example:
DS in bucket after 30 sec…2 gallons x 2 = 4gpm
“Soap” pulled in 30 sec…4 cups x 2 = 8 cups/min
4gpm = 512oz/min minus 8 cups soap = 448oz/min
8 cups soap = 64oz soap/min
448/64 = 7:1 DS injector ratio
