Can this product be used in carpet? How good is against dust mites? Thank you in advance.

Yes, the Zero In Bed Bug Dust Mite Killer Powder 250g can be used on carpets, as it’s designed for mattresses and “all household furniture”, and the puffer-pack format is specifically for cracks, crevices and surface treatment around sleeping areas.

Against dust mites it is designed as an “effective protection” product, using natural pyrethrins which are widely used for mite and insect control.