Scorrblock is a potable water treatment that eliminates water scale buildup and rust deposits and prevents their reformation! Scorrblock is a one-stop product for practically all water appliances except for cooling towers that might require an algae/slime killer. Boilers in particular are Scorrblock protected without the need for water analysis, pH adjustment, or oxygen scavenging. Just be sure to maintain a proper manual or timed blowdown and the rest is done! Just remember that metal can't oxidize when oxygen can't contact it. Scorrblock provides a magnetic coating of calcium phosphate that will never form a buildup but will constantly swish off and be instantly replaced.