I use biobizz nutes ONLY with nuteless soil...been using it for several seasons now (indoor)...beeen thru all the varying things to help, increase, reduce, etc.....now I only slow down feeding the last 10-14 days of what I believe to be a harvest date....but I never specifically flush anymore...since I've been through those blind tests some time ago....since I only vape, flavors are very important and just never saw a definitive difference either way....but I say to all those with questions...by all means, do what you BELIEVE will aid in you grow....and enjoy the results...