Formaldehyde purification rate up to 99%?No secondary pollutants?Keeping allergy awayProduct Efficacy:- Uses natural plant extracts to [remove formaldehyde, disinfect and purify]- Tested to have a purification rate of up to 99% within 30 minutes while neutralizing odors- Works day and night without contact with a medium- pH value 6.5 - 7.5, harmless to human, no rising needed, no residue left- Safe for use around children and pets