One of my custommer have Ice Bank ( Coils system in pool) Refrigerant is R717. Now output temrature of water is 0.5 C to 2 C . Compressors works only 8 Hour and stock Ice throw to coils, Then compressors stop and system use same ice for all day. Now this company wants -6C water output temp. Now question is if we add ethylene glycol %20 with water and freze this mix in -7C. can we get output -6C Water for all day ????? I never saw somethink like that. is it possible or not