Warewasher deliming/descaling system

A warewash machine for washing wares, comprising:

• a chamber for receiving wares, the chamber having at least one spray zone in which a liquid is recirculatable from a tank to a spray assembly for spraying the liquid on wares;
• a delime system configured for delivering a delime solution to the tank;
• a controller configured for operation in at least one ware cleaning mode and at least one delime operation mode, wherein, in the delime operation mode, the delime system is controlled to carry out a delime cycle in which the controller:
• controls the delime system to deliver delime solution into the tank and then circulates the delime solution;
• and
• carries out an acidity reduction process to reduce acidity of the delime solution by at least one of (i) causing delivery of fresh water into the tank to dilute the delime solution in the tank or (ii) causing delivery of detergent into to the tank to effect some neutralization of the delime solution in the tank.