Sorry if It gets long I will try to keep it short also I am no english major so please excuse the poorly structured wall of text. (also Im a lil baked)
-Organics have no place in hydro(opinion alert).....Bleach as a general additive is used in a .5 ml per gal (6-8 drops). At this ratio is use is limited to having an oxidizing and sterilizing effect, while helping maintain longer life a nutrient solution and fighting off pathogens.
-Things can get funky in a rez that is using organic nutrients, as the natural process of life and death occurs, or algae build ups etc.. Bleach keeps these things in check at the .5 additive dosage(some say daily. i beg to differ once you are dialed in, I say weekly). Your root hairs dying often float out into the rez or water lines and are considered organic matter that will spoil a rez left unchecked(hence why many opt to clean out a rez every 7-14 days.)
-Now the claims of funky smells..... using bleach as I spoke about at a dosage of .5 ml per gal as a bench mark to keep a rez sterile. For situations of odor no matter what you do it involves a treatment level of 2ml per gal (plants can tolerate much more then that) and an entire system flush with that dosage for a 30 min interval is usually required to kill off the bacteria associated with the smell thats being produced(dirty socks). once treated fully you will notice no smell ever again.(as long as you keep bleach handy) and when you get to a more comfortable level with this knowledge you will be able to run 8 week cycles without a rez cleaning.
-My first encounter with rez smell!!!!! and tasted in buds.....
When I purchased my first hydro system (from craigslist) in used condition I assumed a good cleaning was in order..... using bleach to scrub and fill no matter what I did i could not get the smell out of this rez..... I couldnt stop the algae building up and had to keep an eye on things.......I learned about a post from a master called Phatman987976756794 blabla say what you will. bleach instead of H202(
https://www.rollitup.org/hydroponics-aeroponics/327967-bleach-instead-h2o2.html) I studied post within sub post and read numerous commercial growers sites stating the chlorine dosages seemed to be industry standard on much much much more sensitive plants than weed. I treated my entire harvest a (potential 45 day setback if things just died) 2 days after pondering all the info I aquired... I treated with an even higher doasge of 3ml per gal(2.5 was advised) to make sure I did the job. 3 -5 days later the smell came back to a point but not fully.....I re-applied at a rate of 2.5 ml this time and let the cycles run....... a final rez change and the rez never had a smell again......
so as advised by greenhouse growers who encounter problems need to use a treatment dosage to sterilize an entire line this may be in order for some people...... but again its all about your comfort levels as a grower.....
My roots are always hairy white and clean unlike grows prior no matter what system I used I always saw some funk in the roots
Thank you. 
