Hi folks, I'm planning my first hempy grow and am planning a system based on the passive, self-watering system shared by Scotty of TheDudegrows shown here:
This design keeps a constant water level in all buckets at all times by connecting all buckets to a separate water reservoir containing a float valve that controls the water level. That reservoir is in turn fed by another water tank whenever the float valve goes down a bit. I will still have holes in each bucket about 2" from bottom (just above the water l set) to avoid overwatering if there there's a problem with the float valve and to allow me to switch to top-watering if there's problems with system. It will look similar to the system in the attached picture, but without any pumps or top watering rings.
I do understand that there could be issues with standing water--I will use black plastic buckets and avoid organic nutes in tank to try and avoid algae issues. I also have read posts by guys that have automatic self-watering systems using pumps & timers, but I am trying to go super simple here as I have had timer problems before when away.
My goal in trying this system is not to maximize yield, but rather to reduce maintenance and be able to go away on short trips without coming back to dying plants. In fact, I want to grow small plants as I have limited indoor space (2x4 tent w/100w Spider Farmer LED), only grow for myself, and am now seeking variety. So I will use square buckets that are between 1 to 1.5 gallons as my pots
In line with my goals, I was hoping to use a controlled release fertilizer in the medium (likely coco & perlite) and only feed with PH'd water and Cal-Mag if needed. Unfortunately, I live far from the US and cannot obtain Grow Dots or Osmocote Plus (15-9-12) The local Osmocote here only comes in 13-13-13 or 12-25-6. I've read WattSaver's posts and it seems the 13-13-13 runs out of steam. However, I am growing autoflowers, so perhaps my cycle will be shorter? Alternatively, I could skip the CRF and use a synthetic nutrient line in the tank, but that raises questions about how much can I mix in advance and keep in the feed tank. Does anyone here have advice on how to move forward here? Or, if anyone has tried this kind of system before and has any advice (including "Don't do it"), I'd really appreciate that. Thanks!