For example, a minimum wage of $10 per hour will have no effect for workers whose marginal productivity in a given line of work is greater than $10 per hour. The legal supply and demand remains unchanged for such labor.
One way to keep control of the time you run the swimming pool pump is to run it several times a day for short periods of time. If you want to activate the pump once a day, start with six hours, but never go lower than five hours, especially in the summer. If your pool is in constant use, you may need to run the pump for up to eight hours per day, frequently checking the water clarity and chemical balance.
1 Install a timer on your pool pump and run only as long as necessary each day to keep the water clean. In general, run your pool pump eight to 12 hours during the summer. During the winter, only six to eight hours are necessary.  Clean strainer baskets and filters regularly to help your pool pump run more efficiently.