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Does iron resin (RES1) need to be used with the Naomoto HYS-58 (IRN5) iron?

Yes, in order to prolong the life of the iron and to get the best results when ironing, it is best to use the iron resin. The iron resin filters water and removes mineral deposits from the water before it collects and hardens inside the iron. Using distilled water provides some protection, but using iron resin is better.