A gradual release agent has been tested that limits the growth of iron bacteria sludge found in leakage points in tunnels and known to cause problems such as blocking of drainage channels. The test results have shown that the growth of iron bacteria sludge can be controlled by placing soap-like materials containing DDAC or soluble glass containing copper at leakage points, and also revealed the amount of agent required to cope with each leakage volume. A system was proposed to regularly replace cartridges filled with the agent, with due consideration on the required amount of agent.

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