Abstract: A hand holdable applicator for delivering solutions and materials in a pressurized fluid system. Additives of solutions or materials are contained in replaceable, collapsible cartridges or liners, responsive and compressible to external fluid pressure regulated by the operator. Upon compression, additives combine with variably controlled fluid ingress and are mixed before dispersing through a nozzle having varying spraying configurations. The applicator may hold a plurality of cartridges, and additives may be administered separately or in combination.