ParaDyne liquid polymer activation systems from IPM Systems have a low-maintenance neat polymer check valve, a non-impinging rotor, no recirculation of solution and a seal flush valve. The chamber handles up to 20 gpm of water, and a post-dilution line can be added to achieve an additional 20 gpm. The neat polymer check spring is outside the polymer flow path, eliminating polymer gumming or clogging around the spring. The chamber uses a non-impinging rotor that pulls polymer through the mixing zone instead of pushing it with an impeller. The solution does not recirculate through the mixing zone, eliminating partially hydrated polymer molecules. 855/328-9200; www.ipm-sys.com.