I've always used nothing but 0ppm reverse osmosis to clone with. I used to dip my cuttings in cloning powder but lately just sprinkle it into the water a bit. It's very un soluable so I have a mesh filter bag on my pump. But I just use a 5 gallon bucket and PVC pieces stick through the lid that the cuttings set in. I got tired of using collars that algaed and needed cleaning every time.
[/QUOTE many people burp first day and keep going from there but you can wait longervif concerned cup may dry out too fast but look at leaf droopahe is a big sign of success or failure at first. Too much droopage, there's an early health problem