Water in a RDWC shouldn't be over 70degrees. I would suggest using DM Gold for your system. If you don't already have a system and are new to Hydro I suggest going with the ProGrow system. It is a shallow water system and is a easier and more friendly to use.
this is great info guys so i got another question going to be using 30 gallon bucket how big of a pot holder should i go with 6" or bigger ??? i mean whats going to hold the plants roots / and plant
