I talked to the seller yesterday while picking up radon monitor. She was miffed that I had suggested removal of the dust product she has spread in the crawlspace every year. I told her I couldn't taste anything after one breath of the stuff but that didn't seem to bother her. She said it is called Dryon, don't know if the spelling is correct. Googled it but came up with nothing that sounds like it. Anybody know what it is?