Before moving forward; first read your manufacturer’s
instructions. Some manufacturers require only distilled water (like
Diamond Crown) to operate. Do not disregard these directions.
the contrary if you have no instructions and your humidifying device
looks like a hockey puck with holes you probably need to charge the
device with what is called “credo solution” a combination of
propylene glycol and distilled water. This solution typically called
fifty fifty has a property of maintaining 70% humidity. If the
humidity within the humidifying device becomes to low it will
automatically release water into the air humidifying the device. On
the contrary if the moisture is too high the solution will absorb
moisture from the air, hence meaning you do not want to saturate the
foam. Moreover, if the foam is saturated it will not absorb water.
you have once added the credo solution you DO NOT have to add it
again for approximately 1 year. You DO however have to continue to
add distilled water to the foam. This is a common mistake found
among fellow aficionados.
recharge your device; simply wash the foam completely with distilled
water and add the credo solution once again to the foam and recharge
the system until 70% is once again reached.
Courtesy of Cigarado.com