"How can a substance containing toxic metals be beneficial?" Almost everything in your house has "toxic metals" in it. Your daily multi-vitamin has "toxic metals" in it. The key is keeping the metals in places where they won't get into you in quantities that can cause harm. Using coal ash in products like concrete and wallboard keeps ash out of giant disposal ponds next to rivers. That's beneficial and even the U.S. EPA agrees 1.usa.gov/1bIyP62 The best solution to coal ash disposal problems is to quit throwing it away.
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