Safety concerns. Always marinate meat and fish in the refrigerator. You can use some of the marinade for basting after removing the meat or fish from it only if you bring the marinade to a boil and cook for five minutes to kill any bacteria.
Running the pump at night should only be when you are doing a major chemical treatment such as algae clean-up. Your pool is more vulnerable during the day, plants don't grow at night the way they do during the day--that's true of ALL plants including Algae.
How long should I run my pool pump each day? Most pool filtration systems are sized to circulate and filter the water twice in 8 hours. We recommend that you run your pool pump 6-8 hours in the winter and 10-12 hours in the summer.