I love that troubleshooting form!
I realize that you are not having any problems right now and keep in mind that I am inexperienced... but two things popped out at me that I would not have done, and I wonder if it will cause problems for you in the future. I leave it to the real experts or your own research to determine if my observations have any merit here.

The first is your kitty litter tubs. I considered using those tubs myself because an aunt has lots of cats and seems to go through a lot of these tubs, but why no drain holes in the bottom of them? I realize it must be easier to transport them this way, but I am worried that stale water in the bottom of the tub will eventually cause root rot. You may be keeping this from happening now with your natural experience telling you how much water to add and when, but I am afraid that this is going to eventually cause you troubles as the water needs change. You have read my grow log and see how I use the point of runoff to determine the water needs of my plants. Also, I know that later there is a need to flush the plants if giving nutrients, and of course this is not going to work with a sealed tub. One could fix this pretty quickly with a large drill I would think but then you are going to have to collect the drainage somehow.

The other is your RO water. I think in every case I have seen someone using pure water, I have seen along with it suggestions to use Cal-Mag to add necessary nutrients back into the mix. Calcium, magnesium, iron, and, trace minerals deficiencies can be avoided this way. Now It may be that since you are also using well water that you may be getting these nutrients from there. If it were me, I would be familiar with how these deficiencies present as problems in your plants and be ready to act on it. I do think that it is easier to prevent than to cure however.

Other than that, I am in awe. Your sun room sounds like a wonderful place and has me thinking about the possibilities of getting my brother to build me an enclosed porch this summer. I'm thinking of a wonderful quiet and sunny place with ferns and azaleas and the african violets my mother always grew. Maybe a few veggies too. That and a good rocking chair. Everyone needs a nice place to practice smiling.


Emmie