In order to be absolutely sure about the water tightness of the structure an additional layer of pond quality PVC foil of 0,5 mm thickness is applied. First to the sides and stapled in the top of the foil ( above the back panel watering line ). Followed by gluing this foil to the coated wooden panels with silicone. The bottom part is folded and glued together to increase the strength of the bottom section.
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