YES, that's what I mean...using the same roots generation after generation...It works for me and Snow White...
Additionally, I use the same nutes in my hydro system for the whole life of the grow...I use the GH nutes with the Lucas Formula...I dont change the res at all during a grow, just add rod water and/or nutes...the ph is very stable at about 5.8 and I keep ppm at about 900...4 generations (3 harvests) and counting with only about $30 in nutes...
A very very very inexpensive way to grow my own!!!