OK, hypothetically based my studies these were the numbers I cam up with for Pretreatment Consumption
On our Lawson automatic pre-treat machine , 34 grams of pretreat product per 100% coverage 16” x 22” (352 sq in ) full front garment pre-treatment provided good washability of the tested garments .
With that metric here are some facts & assumptions:
1 liter =1000 grams water weight plus the weight of dissolved solids/salts
1 pound is 454 grams
1 gallon of the pretreat should weigh 8.5 pounds ish
I liter of pretreat will theoretically treat 34/1000 = 29.41 100% coverage 16” x 22” full front garment pre-treatments.
To address your left chest question if you can control PT deposit on that small an area 6x6=36 sq in would theoretically be 36/352 sq in= 12.67 %. 12.67% of 34 grams= 4.30 grams/1000 or 232 (36 sq in) left chest images per liter of pretreatment. Expand that to a gallon and you have 3.77 l per gallon x 232 images
for a whopping theoretical 875 left chest pre-treats per gallon
These yields would only be obtainable in a high volume shop under very controlled conditions with a precision automatic pre-treatment machine.
We currently consume as much pre-treat product- maybe more- than we put on the shirts, charging and flushing the equipment
The amount of white ink consumed would be a function of the artwork not the pretreat.
Hope this confuses you a bit more, I’ll deny it all under oath
Mind's Eye Graphics, Inc.