A modular filtration platform system comprising: at least one modular filter assembly (12a,b) having a manifold head (14a,b) and a filter cartridge assembly (16a,b) characterized in that; said filter cartridge assembly (16a,b) includes: a filter housing sealingly containing a filter media, and having ingress and egress ports for fluid transfer, said filter housing including an annular collar for mating to said manifold head (14a,b); a locking clip attachable to or integral with said filter housing annular collar having a sidewall, said locking clip forming a resilient protrusion or insertion segment which extends radially from said filter housing annular collar sidewall for mating with said manifold threaded annular collar receiving aperture (33, 35); said manifold head (14a,b) includes an attachment base having a threaded annular collar, said manifold head (14a,b) having ingress and egress access ports (A-D, A'-D') in fluid communication with said filter housing ingress and egress ports, said manifold threaded annular collar having a receiving aperture which is in mechanical communication with said resilient protrusion or insertion segment of said locking clip when said filter cartridge assembly (16a,b) is secured to said manifold head (14a,b), such that said filter cartridge assembly (16a,b) is locked in position by said resilient protrusion or insertion segment held in place by said receiving aperture (33, 35); and a support bracket for mounting said at least one modular filter assembly (12a,b). at least one modular filter assembly (12a,b) having a manifold head (14a,b) and a filter cartridge assembly (16a,b) characterized in that; said filter cartridge assembly (16a,b) includes: a filter housing sealingly containing a filter media, and having ingress and egress ports for fluid transfer, said filter housing including an annular collar for mating to said manifold head (14a,b); a locking clip attachable to or integral with said filter housing annular collar having a sidewall, said locking clip forming a resilient protrusion or insertion segment which extends radially from said filter housing annular collar sidewall for mating with said manifold threaded annular collar receiving aperture (33, 35); said manifold head (14a,b) includes an attachment base having a threaded annular collar, said manifold head (14a,b) having ingress and egress access ports (A-D, A'-D') in fluid communication with said filter housing ingress and egress ports, said manifold threaded annular collar having a receiving aperture which is in mechanical communication with said resilient protrusion or insertion segment of said locking clip when said filter cartridge assembly (16a,b) is secured to said manifold head (14a,b), such that said filter cartridge assembly (16a,b) is locked in position by said resilient protrusion or insertion segment held in place by said receiving aperture (33, 35); and a support bracket for mounting said at least one modular filter assembly (12a,b). a filter housing sealingly containing a filter media, and having ingress and egress ports for fluid transfer, said filter housing including an annular collar for mating to said manifold head (14a,b); a locking clip attachable to or integral with said filter housing annular collar having a sidewall, said locking clip forming a resilient protrusion or insertion segment which extends radially from said filter housing annular collar sidewall for mating with said manifold threaded annular collar receiving aperture (33, 35); said manifold head (14a,b) includes an attachment base having a threaded annular collar, said manifold head (14a,b) having ingress and egress access ports (A-D, A'-D') in fluid communication with said filter housing ingress and egress ports, said manifold threaded annular collar having a receiving aperture which is in mechanical communication with said resilient protrusion or insertion segment of said locking clip when said filter cartridge assembly (16a,b) is secured to said manifold head (14a,b), such that said filter cartridge assembly (16a,b) is locked in position by said resilient protrusion or insertion segment held in place by said receiving aperture (33, 35); and a support bracket for mounting said at least one modular filter assembly (12a,b).