The entire Dynaflux line provides year-round pump protection for water recirculators and other closed loop cooling systems. reduces the need for water fill maintenance by reducing water evaporation. The 947 formulation protects to 10°F with no dilution necessary. Can also be diluted with distilled or de-ionized water for additional economy. The 947 formulation is made with propylene glycol for a more environmentally friendlier version. For maximum effect, 947 should not be used in machines where a ethylene glycol anti-freeze has been used in the past.