I have just been to the shops and bought some pure soap, more bicarb and some washing soda and plan to make my own washing powder with that. I found a recipe for it. My only question is how much do I use in a front loader? Should I just use trial and error until I find the right amount for me?

PS: I did buy 2 boxes of normal washing powder too coz it's on special and also in case I'm not happy with my home made one.