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3.3 filling water 1
thaeng 3.3. must have a capacity of not less than 6000 liters
3.3.2 galvanized material with a thickness of at least 3 mm
3 3.3. channels for verification, there are 4
3.3. notification system water level by electricity
3.3.5 there are no less than 4-inch size tubing for drainage overflow
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