The dust exposure is enormous, at first I thought, fits already, I'll bring out the stuff without respirator, and that was a mistake. Burning eyes and scratchy bronchi.
With respirator apartment treated, especially cracks and just dusted under the cabinets. We always had problems with small flies in the cracks of the blinds guiding on the balcony: once dusted since no fly more.
Conclusion: the effectiveness is great, no fleas, and especially no more flea nests behind the baseboards. But the land application in the apartment is a mess and only recommended with respirator and goggles. There is completely non-toxic. For the carpets I suppose now the Pet-Vital spray Bio-Insect-Shocker. Although stinks, but dusted not so enormous.