The experimental studies on effect of filter structure and resuspension on non-steady state filtration process were performed. The experiment included production of filter of assumed properties. For observing the structure and distribution of dendrites formed due to pure deposition, the aerosol stream was flown through filtration bed with velocity 0.2 [m/s]. In the second part of experiment pure air was flown through loaded filter with velocity over 1 [m/s] to observe the effect of resuspension on dendrites shape and size. The results are presented in form of microscopic photos.