Reka wrote:
...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?

converting 1 ga into 3.8L gives you a concentration of 10ml to 3.8l or
..5262ml 100% physan to 1L, time that by five, devide it by .5 (solution
precentage) you get 5.2631ml

or a hefty teaspoon of the 50% stuff

Yep I'm board

Jack