Pyrithione preservative system in solid rinse aid products

A solid rinse aid composition comprising:

• a) from about 0.05 wt-% to about 20 wt-% of a pyrithione preservative;
• b) from about 5 wt-% to about 80 wt-% of hardening agent comprising a solid acid;
• c) two or more nonionic surfactants comprising one or more alcohol alkoxylates having the formula R-O-(CH2CH2O)n-H, wherein R is a (C1-C12) alkyl group and n is an integer in the range of 1 to 100, and an ethylene oxide-propylene oxide (EO/PO) copolymer;
• and
• d) additional functional ingredients,
• wherein the composition is a solid concentrate, and the solid concentrate generates a stable and aqueous use solution having a neutral to acidic pH.