When I started growing, I had dreams of running DWC. After fighting root rot for a few crops, I switched to drain-to-waste coco and it's been mostly good times since.
I've got some interest in running recirculating coco so I can run smaller pots and water multiple times a day. And for other reasons. Will a recirculating reservoir make my plants vulnerable to root rot?
I've been running a mix of chemical and organic. A while ago I mixed up too much nutrient solution and and put a bubbler in it. After a week it got a little bit stank but that didn't seem to harm the plant, so I'm thinking it might be alright, so long as the plant has a proper drying cycle.
I will be the one to answer your question as it’s just got full up of dick swinging lol.
Ideally you shouldn’t run coco recirculating unless you plan to constantly monitor the levels of every nutrient coming back to the reservoir.
the reason being is that coco can and does hold onto certain nutrient elements, binding of Ca and releasing back K for example.
So your recirculating return solution could be out of Ca and have too much K for the next feed.
My honest advice would be to run it DTW and make some adjustments for removal of the drain solution or use a DTW at lower EC and run it similar to a BLUMATS system where you don’t get very much of any runoff out of the bottom.
If you want to continue with the recirculating then rethink your medium choice.
you could recirculate using stone wool aka rockwool with hydro rocks aka clay pebbles aka hydroton balls.
Due to the way that coco’s CEC responds and how the coco (although dubbed as inert) can bind certain nutrients and release others it’s not going to be the best choice in this instance.
PA hydroponics on YouTube has some good videos about creating some fallponic systems utilising RDWC setups with a reservoir outside the system and pumps etc fitted inline to reduce heat inside the reservoir to keep temps cooler through the RDWC system overall.