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Obviously you have certain precautionary measures to follow when using them. But, it's no different than the caution used for instance household drain cleaner or lawn chemicals. Just follow the directions and exercise common sense.
I'm not sure what kind of rules and regs you have where you live pertaining to these chemicals. Here you have to have a chemical applicators lisence. To obtain one here, you take an open book test and pay $30. To find the chemicals, check in the yellow pages under chemicals or contact your local farm and ranch supply store. Here, you can also purchase these products from the state. Again, check with you local county extension agent.
I hope everything works for you.
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