Haier HSU-07RK03/R2 Operation Manual page 24

The air purifying filter of multi-lights touching intermediary and the electrostatic air
purifying filter accessories with machine will be used based on real situation.
The air purifying filter of multi-lights touching intermediary will be solarized in fixed
time. In normal family , it will be solarized every 6 months.The solarization time will
last no less than 8 hours under the state of abundant sun.