When water flows backward through the water supply system, it is called backsiphonage or backflow. When that water is accidentally mixed with hazardous chemicals or bacteria, it is called dangerous! For this reason, never use spray attachments without a backflow prevention device. The chemicals used on your lawn are toxic and can be fatal if ingested.
If you have ever tried to cut or trim veneered pieces like a door, you know splintering can be a problem. A solution is to use a utility knife with a new blade and a straightedge to mark the cut line deeply on both sides. Some carpenters also use masking tape before making the knife cuts to stabilize the edge and protect wood from the saw making the final cut. Most important is to have a sharp fine-toothed blade in the saw.