Pool Filter Sand...Dangerous?!?

I haven't had any problems with mine nor heard of chemically treated, however see what the prices are, and go with the cheaper, mine was 9.16 for 60lb.
and wash it. I did a large tupp bowl, and mixed it under the kitchen faucet until the water ran clear. (about 30-45 seconds)
 
Our pool supply place has treated and untreated sand for filters.
 
I've used it in many of my own tanks with no problems at all. I didn't have any trouble finding sand that wasn't treated.
 
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