A multi-compartment syringe apparatus (500) for in-situ mixing of a plurality of products before use, the apparatus comprising: a tube; a hollowed flexible plunger (530); a one way filter piston (514), connected to the plunger (530), the piston confining a first compartment (502) at a side of a needle (540) of the apparatus, and a second compartment (510) at a side of the plunger, wherein the filter allowing passage of content only form the first compartment to the second compartment (510); a first product (506), stored in the first compartment (502); a second product (508), stored in a first breakable container (504) disposed in the plunger (530); thereby the second product (508) mixes with the first product (506); and the mixed products are then pushed out of the apparatus, through the needle (540).