In this work we demonstrate that PHIP-polarized fumarate solutions can be purified of contaminants by acid precipitation of the fumarate as a solid, and subsequent redissolution of the pure material in a clean aqueous solvent. This physicochemical manipulation is possible because the solubility of fumarate is significantly reduced in acidic solution . We perform the hydrogenation reaction in a steel reactor, which allows us to work with high hydrogen flow rates, and hence form hyperpolarized fumarate at higher concentrations than was demonstrated in previous work . This makes PHIP competitive with dDNP for the production of nuclear spin-polarized fumarate, since we show that it can be formed in higher concentrations and with higher C polarization.