Copper and your orchids

[Leisurely]

I continue seeing members making reference to Phyton and Physan 20. I have never used either but do use a product called RD 20 that is a disinfectant labeled to do the same thing that Phyton and Physan 20 do. Does anyone else use RD 20? It is about half the price as the other two products. A quart bottle is about $10.00 and it goes a long way because you only use 2 tsp. per gal.