Keep your chlorinator at 8 hours a day while it is still hot, 4 in the am, 4 in the pm. Clean the cell & make sure it's producing chlorine bubbles. Test your water in store to check chlorine and shock after heavy use or if cloudy. ENJOY your last few swims, and make sure your heat pump is serviced & running! If not sure, call us out on a one-off service and we'll do it all