Turn off your pump. Sand filters have a multi-port which is a large valve with 5 – 6 settings: “waste,” “filter,” “backwash,” “closed,” “recirculate” and rinse.” Move the multi-port handle to the “backwash” setting and turn on your pump, taking note of the color of water in the sight glass (small plastic or glass jar on the multi-port next to waste line). After approximately 2 – 5 seconds, you should start to see water traveling out of the “waste” hose. After 10 – 15 seconds, you should see cloudy, dirty water.  After 30 – 60 seconds, shut off your pump and move the multi-port handle to the “rinse” setting. Turn the pump on again. If your pool water is generally clean, the water in the sight glass should be clear. If it is green, the waste water will likely be as well. Rinse for 10 – 15 seconds. Next, turn off your pump and repeat the cycle between “backwash” and “rinse” 3 – 7 more times. When your sight glass stays clear on the “backwash” setting, you have gotten most of the used DE powder out of the filter. Turn off your pump, move the multi-port handle back to the “filter” setting and turn it on. Recharging is not necessary, but a sand filter should have the sand changed every 3 – 4 seasons.