The CNU will prevent any further accumulation of scale and, in most cases, actually remove any existing scale over a period of 60 to 90 days depending on the use of the boiler. There are two types of boilers, steam and hot water. Steam boilers can be identified by the presence of a sight glass near the low water cut off mechanism. Hot water boilers do not normally have a sight glass. Hot water boilers circulate hot water through the system.
Steam boilers generate steam that is circulated through the system or is used as a process.
CNU installed on the feed line and the outlet line of a hot water boiler system will treat and protect the entire system against scale accumulation and corrosion. CNU installed on the feed line to the steam boiler will protect the boiler from scaling, but have no effect on the lines circulating the steam through the system. Therefore, the boiler still needs corrosion treatment for the steam lines.