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The only thing I would add to what Jamie Johnson already said is that
you shouldn't use too much KNO3 at once; you don't want too high a
concentration of nitrate. Potassium, on the other hand can be used in
higher levels provided that you don't add too much at once and cause
osmotic shock for the fish.

To dissolve the potassium sulphate, just put the water into a large cup
and boil it in the microwave. Stir it vigorously and you should have no
problem getting it all dissolved quickly. Once it cools, you may get a
little precipitation, if you've used too much or if you cool it too
cold. Otherwise it stays in solution.

I always keep the trace nutrients out of it and dose them separately (if
at all since there are enough trace nutrients in soil for most rooted
Steve Pushak                              Vancouver, BC, CANADA 

Visit "Steve's Aquatic Page"      http://home.infinet.net/teban/
 for LOTS of pics, tips and links for aquatic gardening!!!