Yes from the garden store, that's where it comes from (food grade), but also yes, not the pool grade variety. That is heavily polluted with other stuff that isn't good for you.

I'm going to clutter my camera with some lunar eclipse photos this evening. The end to a nice weekend in which I got some work done around the house, sold an item on eBay, made three jars of fresh pickles, and will be making bread and roasting a chicken for meals this week. I'm back on the alternate day fasting, so having meals ready for those small calorie days is helpful, I'm less likely to graze and go above the 500 for the "alternate" day (it isn't a full fast on alternate days, it is regular meals one day, and one 500 calorie meal the next, or a couple of smaller meals totalling 500 - and the law of averages works with you to lose weight as well as have the health benefits of fasting without the health risks).

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Typo fixed