It is well known that the permeability coefficient of permeable bricks will decrease with the passage of time. This is because the small holes on the surface are blocked by sand, mud, tires, and other slag dirt, so that the water can deteriorate. After construction, after several years, only 1/10 of the water can be left. If the pores are blocked, it is difficult to recover. In order to maintain the initial permeable ability, regular protection and maintenance are required. The most useful method is high-pressure scouring. Wash it once every few years . If the gray joint sand is washed away due to scouring, please fill the gray joint sand again after the permeable brick is dried. If the mortar is stained during construction, it can be washed away with water; if the mortar is hardened, it must be washed away with hydrochloric acid diluted 20 times, and then washed with water. The mortar becomes difficult to wash off with the passage of time, so it must be disposed of quickly.
If there is chewing gum on the outside, please scrape it off with a small piece of bamboo or freeze it with ice, etc. and quickly scrape it away. It is also useful to use a gum stripper.