I've never heard of foundation having anything to do with how fast honey will granulate. The rate of granulating for honey is a function of what flowers the bees obtained the nectar from. How well you filtered impurities out (bits of wax, dust, threads of filter material). What temperature you're storing the honey at.
I cover the 30 gal tanks with plastic with electric heater underneath. After botteling,
the cabinet at my roadside stand is warmed by another heater. Seems like about 50 degrees causes granulating sooner. I try to keep it about 80 degrees at both places.
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