All mine are bioactive but using exo terra's and not screen enclosures.
Assuming you will use some form of high sided tray in the base of yours, it will still collect excess water the same as mine do, so here goes.
We don't want the top soil to get into a water sodden muddy mess, just damp. So to allow water to drain from the soil, you need the drainage layer.
The main drainage layer itself is simply made of of clay 'hydro' balls, readily available. We then need a way to seperate the soil from the drainage layer so a water permiable barrier is needed between the two layers. Again it's readily available.
You need to sort out how you will remove excess water as the drainage layer will fill and we don't want water going stagnant in there or getting high enough that it's up to the soil layer.
My way is simply to use a piece of plastic pipe in the front corner that sticks up just above the top of you soil layer and right down to the bottom. A few slits or holes, small enough so only the water passes and not the hydro balls, allows you to simply siphon out the excess water.
How often you need to siphon will depend on how heavily and how often you mist. Personally I do it every couple of days as I don't want water sat in there. As you can see in the second picture, it needs doing today. I used clear plastic tube so the level can be seen but you could wider, coloured pipe that you can pop a syphon tube into.
Hope that helps.
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