Which factor does NOT affect mechanical action in a washer?

Water pH does not significantly affect the mechanical action in a washer because mechanical action primarily relies on physical forces rather than chemical properties. The mechanical action includes the agitating or tumbling of items within the washer, which is determined by factors like load size, RPM, and water level.

Load size is crucial because a larger or smaller load can impact how effectively the machine can agitate the items. A too big load might restrict movement, while a too small load might not utilize the machine's efficiency.

RPM is important as it dictates the speed at which the washer drum moves, influencing how well the clothes are cleaned through agitation and friction. Higher RPMs typically mean more forceful action.

Water level is significant as well, impacting how much water is available to facilitate movement and separation of the items being washed. If the water level is too low, it can compromise the mechanical action and lead to unsatisfactory cleaning results.

In contrast, while water pH can affect the cleanliness and chemical effectiveness of detergents used, it does not contribute to the mechanical forces at play within the washing machine itself.