with lemi shine - as mentioned LESS IS MORE!
start around 1/4 tsp and keep cutting the ammount in half until you get an unsatisfactory result, then increase to somewhere in the middle of the two ammounts.
currently i'm using a full, level, 0.5cc powder scoop - thats 1/10th of a tsp - and could probably go lower if i wanted to, but just havent bothered.
HTH