Method for the cleaning of water mains

A method of cleaning water mains for distributing water to users through water flow measuring meters, said method comprising the steps of:

• a) notifying all water users of the upcoming cleaning of the water mains;
• b) isolating a section of the water main to be cleaned from water input and water output between an entry point and an exit point;
• c) closing off all branches of said isolated section of the water mains to be cleaned upstream from the water flow measuring meters;
• d) connecting a flow of pressurized air to the entry point of said isolated section of water mains to be cleaned;
• e) injecting atomized chlorine into said flow of pressurized air to disinfect said mains;
• f) injecting a polyphosphate inhibitor into said flow of pressurized air to soften the deposits in said main, said atomized chlorine and polyphosphate inhibitor being present simultaneously in said flow of pressurized air;
• g) utilizing said pressurized air to blow out all water in said isolated section of water main through said exit point;
• h) inserting slugs of water into said isolated section of water main at said entry point;
• i) allowing said pressurized air and said slug of water to exist said isolated section of said water main at said exit point;
• j) removing said flow of pressurized air from said isolated section of water main;
• k) opening up all branches of said isolated section of water main;
• l) restoring the flow of water to said isolated section of water main.