Micro is a prefix meaning one millionth when used with a measurement unit. In everyday language it can also simply suggest that something is very small.
What this means at your property
A product description using “micro” does not automatically state a measurable performance. A particle size in micrometers and a marketing description of a cleaning process communicate different levels of information.
What should I look for in a specification?
Ask for the actual unit, measured property and conditions of the measurement. If the term appears in a proposed treatment, identify the equipment and intended result rather than relying on the prefix to explain what the service does.