DIY gravity drain multibucket controller

An oldie but a goody , I am planning to build for a 4 bucket dwc controller. Leaning toward making a nutrient level controller with a bucket stacked on a bucket with a float in the lower bucket to keep the dwc buckets levels topped up but not recirculated.

I need two containers that stack , 5 gal buckets might be a little small so I will look for a two sturdy totes to seal the deal.

My system is nearly complete now , just need the controller and she is ready
 
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