Is a sponge just a sponge? Kenco sponges are manufactured in Australia to ensure a premium grade product. Not all sponges have the same water holding capacity as a Kenco sponge. Some cheaper grade sponges will hold and absorb only a fraction of the water when compared to the superior Kenco product. So in answer . . .Is a sponge just a sponge? No . . . Not all sponges perform to the Kenco standard.