a polymerization reactant injection system having a monomer conduit , a co - catalyst conduit , and a catalyst conduit , in fluid communication with each other such that a polymerization reactant mixture may be formed without mechanical mixers or agitators . the polymerization reactant injection systems of the present invention permit large amounts of polymerization reactant mixtures to be formed without the increased costs associated with additional mechanical equipment . methods for forming polymerization reactant mixtures are also disclosed .