Try to stay away from the mold angle. In this area, it's much easier to forward that one off ot specialists. we do radon, termite/wdi, well potability, and septic dye's (never liked those and try to disuade clients from using them. I don't turn down the request though). also think about getting into pools as well.

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Carpe Malleus & Sponem Bohem,
Paul