Non-acidic liquid cleaner and softener for heating systems. Prevents sludge build-up, removes corrosion residues and deposits from heating systems that have been in operation for more than 6 months. Add 250 ml of 400 Plus for every 100 litres of water in the system, allow to circulate in the system for at least 8 days, flush the system thoroughly with clean water and refill with softened water with added corrosion inhibitor.
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