Hello.
Teaspoon
: a unit of measure equal to 1/6 fluid ounce or 1/3 tablespoon or 5 milliliters.
If you choose to dose in ml then 20ml 3x a week, no division needed, so that would be 60ml total within that week.
The same for KH2P04- 12ml 3x a week so thats 36ml within that week etc.
If dosing by the Tsp then 3/4 Tsp within that week so on and so forth.
I don't know if this will be of help but worth posting I suppose:
http://www.convert-me.com/en/convert...aspoon.en.html
If you have any more questions feel free to ask.
Picture:
http://en.wikipedia.org/wiki/Teaspoon
Your dosing does not have to be completely exact.
You're grammar is fine.