To winterize your backyard pond with a leaf net, stretch a 3/8-inch mesh pond net over the surface before leaves start falling heavily. Secure it with landscape pins or frame supports like PVC hoops to catch up to ninety percent of leaves, preventing debris buildup. Removing leaves reduces organic decay that could harm water quality and fish health. Check and clean the net regularly during fall, then remove it once snow covers the pond surface to allow natural oxygen exchange.