HI ALL! My LA Confidential is a 7-8 week flower strain and on Friday I go into week #6, so I will start watering without nutes from then onto finish. My question is -> Since I us RO Water, do I still put Cal/Mag in it, or use just PLAIN water with Absolutely NOTHING else? How do you FLUSH?
yes you are going to want to just use the plain water in the flush. Cal/mag is a synthetic and has salts and the reason to flush is to rid the salts out of the substrate. Now if you were wanting to reuse the substrate i would suggest using some enzymes in the flush to truly clean the substrate and compost it for a later use.