how can you reduce amount of water used in dishwasher for a cycle?

You can’t really reduce it in each cycle, but you can reduce water usage by selecting the proper dishwasher cycle. Every dishwasher cycle is preset how for time and water usage. Most dishwashers purchased today are very efficient and only use 4-5 gallons per load. Go back 10-years ago, and they were like 9-10 per load. So newer dishwashers are water savers to start with. I would wash larger loads to cut down on the usage and run out at night time to conserve energy as well.

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