Hkoenig ary600 Manuel D'instructions page 16

Strainer
Dust cup
REPLACING THE WATER FILTER
It is recommended to fill your unit with distilled
water only. Periodically check your water filter.
When the green grains turn blue, change your
water filter. If the filter is not changed at the
appropriate time, calcium deposits may
accumulate on the heater, causing damage or
reduced performance.