This is pretty close to how I do my clones.
Usually get 100%
Also, I use Tap water.
http://www.youtube.com/watch?v=L-jZvg_qCQ8
Also, @Bozo - That is a pretty cool way of taking clones. I use 2" nets pots in my aero system though So I couldn't use that unless it was going into soil. Well I suppose I could free the roots by messing with them. I just don't like upsetting the new clones.
...i guess the best thing about this method is it's simplicity so even a beginner can get successfully rooted clones the first time out of the box, ...it's that easy.
...another nice thing is the size of the clones you can produce although i make even bigger ones cloning directly into coco which for you wouldn't be an option but this Walmart cloner uses vermiculite as it's medium so it is easily rinsed off so the clones can be potted up into a passive system like my coco hempys or an active system like a DWC or ebb and flo.
...as you can see i'm not all that careful to get ALL of the vermiculite because i'm potting up into coco so it's not important i get it all oh and i don't see it harms my roots one iota to do this either.
...the economy is nice too because vermiculite is cheap so one $8.00 bag of vermiculite is enough for me to make a couple hundred clones, at least.
...then there is the fact that it's passive so almost completely failsafe, if you don't use any pumps then there are no pumps that can fail, lol.
anyway, i mainly advocate this method for new people because it is so simple and easy to master and once mastered, learning any other method is like falling off a log.
peace, bozo
btw, here's a shot of a couple i cloned directly into cups of coco so you can see how big these babies can be.