General Hydroponics' nutrient schedule question; ppm based on hanna EC conv rate?

Hey I feel like this is a newb question so here goes:

Is the PPM value given on General Hydroponics' nutrient feed schedules, the 'flora series expert recirculating' in my case, converted from EC based on Hanna, Eutech or 'Truncheon's conversion rate? It's my understanding that the three are different (.5, .64 and .7 respectively) so without knowing which one GH used their schedule's values are useless. 1250ppm at a conversion rate of .5 is 1750 at .7; if GH is using, for instance, .7, while I'm using .5, I would mix to an ec of 2.5 where I should be mixing to 1.8, which would be bad.

I use it and ppm's run me about 1100 in a 5gal dwc. What are you looking for?

different ppms for different stages of growth; currently I mix it in a 2.5 gal water jug and then dump it into the 25 gallon res to really dial it in, but if i get anywhere NEAR what GH says I should be at the plants get FRIED, hence my question.