Massachusetts Plumbers Journeyman Practice Exam

What must all food-waste grinder units be provided with to ensure proper functioning?

1. Hot water supply

2. Adequate ventilation

3. Adequate supply of cold water

4. Water recycling system

The correct answer is: Adequate supply of cold water

The correct choice is to ensure that food-waste grinder units are provided with an adequate supply of cold water. The primary function of cold water in food-waste disposers is to help flush waste through the grinder system, preventing clogs and ensuring efficient operation. Cold water helps keep the grinder cool during the grinding process and helps solid waste move smoothly through the pipes, reducing the risk of build-up and blockages. In some systems, hot water can cause fats and grease to liquefy, creating a higher risk of these elements adhering to the insides of pipes once they cool down. Therefore, the emphasis on cold water is crucial for optimal functioning and maintenance of the plumbing systems. While other options may contribute to the broader context of plumbing and food waste management, such as ventilation for overall kitchen safety or water recycling for sustainability, they do not address the specific requirements for the efficient functioning of food-waste grinder units as directly as the need for cold water does.