The verbose Mr. Giannou intones: I've conducted some tests using potting soils. (snip in the interest of sanity, brevity, etc.) Whenever vendors--whether in "disguise" as "an-ordinary-gardener-just-like-you" or those wearing a sandwich board as they bump/bruise/and assault all they pass on the information highway--start intoning that they have "conducted some tests", I don't know whether to laugh or request to see protocols, independent review procedures, etc. etc. In the case of Mr. Giannou, I would only request surcease and deliverence from his endless self-serving epistles. Catharine/Atlanta, zone 7b