| Iodized salt?
Wow Richard I was with you up until this - didn't you mean without iodine?
My experience with cheap "solar salt" from the big box hardware store is that it makes a lot of foam. It's made in a local back bay, not the cleanest if you get my drift. Back in the water heater department there are a number of varieties of more expensive salt, in 40lb bags, some are laced with additives like YPS but the pure stuff looks like new snow. It's a buck or two more but still cheap.
Tom
[<snip>If you are using salt for your pond for whatever reason, use the solar salts sold as water softening agents. It should say 99.7% pure salt or something similar on the bag. Just don't use any salt with additives in it. And check kosher salts as they often have additives. Table salt with iodine is fine to use anytime.
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