Been getting lots of queries about how these Smile Box are! Do check out this video of the Built of material. The Box has tons of features, it can be run with an overflow tube setting where water flows from the upper box to the lower box. It can also run by a drain valve, which is normally closed and changing the piping system to build a water level in a box. The boxes come with accessories for you to run according to your objective.
Boxes are manufactured by คอนโดกุ้งปู : Smile Box, feel free to contact them for more info.
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