You should seriously consider locating a humidistat controller, no matter how far you have to look. It is THE solution, since you want to maintain a specific range of RH. Import a device if you have to.
They ship international. Not sure if the electrical would work for you, but I'm sure you can find a way to make it work for you... or find something else in South Africa on your own. Check at nursery supply stores, do some research and ask around.
Aside from any device.... You are going to have to try the fogger in different ways and see what works best for your plants in your conditions. We can't grow them for you, it's trial and error.
Last Edit: May 22, 2012 22:14:11 GMT 7 by sunbelle