since I went to a sterile res my roots are always super white and healthy.
I use benny's from germination to seedlings but once the plants go into the main system I use Current Cultures UC Roots which is an organic sterilizer.
Did you ever use DM Zone?
The 2 local (90 miles but it is what it is ) grow shops stopped carrying much DM stuff. Last trip, another customer turned me on to the UC Roots product. They seem to perform the same role. I've had weird ph stuff happening and my res doesn't smell the same. I think it's all OK, but it makes me nervous.
I do like that it's organic and made in USA though.