That looks like a mortar mixing bin. I use them for bottom-watering my plants, too. The plastic lasts well in the sun. It's especially easy when the inserts are all still attached to each other. The thing floats like a boat when dry. But after the pots get separated, the water level has to be shallow, or they bob up and tip over. I water all my plants by bottom watering until soaked - I'm sold on that technique.
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