I'm going to revert back to the other SIP design for my buckets. I've been using the "doughnut design" version which is a central reservoir surrounded by soil, but I've been working through some issues with Gee over in his Gee Spot thread, and we've come to the conclusion that my soil is too wet for my organic grows.
My plants are big and strong but the brix levels are quite low and that's consistent with the bug and deficiency issues that I get around week 3 after flip.
So, I'm going to go back to the original style I started with which is the central column of soil as a footer extending down into the middle of a reservoir. These are quite commonly built as a "bucket-in-bucket" style but, since I am height challenged in veg, I'm going to build it in a single bucket by incorporating a false floor insert.
I've made lots of aeration holes in this insert and cut holes for both my air/water pipes as well as the soil footer container. In my original version I used a 16oz food container as the footer but in this version I'm going down to a 3" net pot which is about 4oz. This will have much less less soil exposed to the reservoir and more of the soil above exposed to air through the aerated floor plate holding it up.
This footer should also serve as a draining mechanism for excess soil moisture in the soil above because of the hydrodynamics of perchered water tables and hopefully keep the soil above moist but not wet and help me get around some of my issues.
I'm also wondering if I'll get different types of roots with this set-up. I typically only get the very fine feeder roots but we've seen other growers showing a very different type of root profile and we've wondered why the differences, so maybe I'll have an answer to that question after harvest.
These changes should go a long way to fixing my overly wet soil which may very well be related to a combination of my homemade mix along with the fact that my 2 gallon buckets are smaller, and more importantly shorter, than a typical bucket which means the perched water table sits at a higher percentage of my set-up than it does for those using 5 gallon buckets.
I'm also going to temporarily switch back from hydoton to perlite for my aeration component to make monitoring the moisture levels in the soil easier when using a moisture meter.
The build is mostly done, I just have to cut the insert to fit, and this is what I'll use for my next plant headed to flower.
I'll repeat that I think this issue may be directly related to shorter pot height (and maybe my mix) as most other SIP growers have not expressed having issues like I have, but I think this other design will allow me to use the SIP strengths while staying with the type of grow (organic) that I want to maintain.