What is scaling in steam boilers?

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<blockquote class="wp-embedded-content" data-secret="JZZ6BeCusH"><a href="https://www.aquachem.ie/uncategorized/what-is-scaling-in-steam-boilers/">What is scaling in steam boilers?</a></blockquote><iframe sandbox="allow-scripts" security="restricted" src="https://www.aquachem.ie/uncategorized/what-is-scaling-in-steam-boilers/embed/#?secret=JZZ6BeCusH" width="600" height="400" title="&#8220;What is scaling in steam boilers?&#8221; &#8212; Aquachem" data-secret="JZZ6BeCusH" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" class="wp-embedded-content"></iframe><script type="text/javascript">
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