You're right. We also use food coloring in re-used 5 gal foam pails with just water to help app.operators to see when they first get foam pick-up at various pressures, nozzle settings, aginst head pressure, etc. It really helps in any dept. using automatic nozzles and portable educotors.
The first thing I would do is google firefighting foams and go to the manufactures websites. This should give you some base information. In my experience we use class A foam about 100 times more often than class B foam. I also prefer 1% over 3 or 6% concentrates. You can produce more finished foam that way. We often will use class A at .1% for mop up and over haul operations to get better penetration and saturation.
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