To reduce the time to do the wall waterproof. From the traditional punching bag that must be packed sand, one bag. The sort and one layer at a time until the height as needed. In this process, which takes no less than 3 - 5 hours.(depending on the desired height, and labour) but if used sand bags waterproof. It just takes more than 1 hours. Can install waterproof sand bags to available.
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