I use peat puck's which seem to be similar to rapid rooters and I find them pretty good. The water gets left out for a day with a little cheap air pump bubbling in it. Whether or not this releases chlorine I don't know but it does bring the water up to room temperature and stops it going flat and airless. I give them water at PH 6-6.3 when its needed. Once they've rooted and ready to be potted into soil I water at PH 6.5 and thats what it is from then on - with some variation.
I just try to always keep it simple and so far (touch wood) have not had trouble with my clones.

Love your sig pushit lol - I used to be a woolhandler