....and it's late. If I want to soak my orchids in Physan 20 solution and
need 2 tsp. of 20% Physan per gallon of water,how many tsp. do I need of
50% Physan for 5 liters? (I can get 50% benzalkonium chloride here which
should be relatively similar, if not equal, to Physan -
http://en.wikipedia.org/wiki/Benzalkonium_chloride)

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Reka

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