Well you are saying exactly what I am wondering---I do change my nutes once a week and sometimes if I see a problem and it always seems to give my plants a kick in the butt. I am wondering if there is more to this which is why I would like to study it further--I am definitely getting the impression that it is worth the extras it causes because I hear about them over and over and bigger plants etc would certainly be worth it. Ph staying more stable I like. Questions I can think of right now would be what percentage Cal Mag w rO water vs nutes (I go 50% now vs nutes)and is there a formula or something for increasing the nutes as the plants grow. And I hav always gone by ppms vs EC because I don't really understand it. AND am I correct in thinking TDS and PPM's are the same. Many ???s Must study.....