Lower water pressures won't have the force needed to make an impact sprinkler system effective. If your sprinklers are falling short or don't seem to be putting out water at a very high rate, you may be better off with a different method of irrigation. You can find out how many psi's you're working with by calling your local water provider or using a pressure gauge that fits over the end of a standard garden hose. Most residential areas have an average water pressure somewhere between 40-60 psi. However, yours might be lower if you get your water from a pump or well. Impact sprinkler heads are usually sold in a couple different materialsplastic and metal. Plastic heads are lightweight, making them easier to turn with a conservative water flow of around 20-40 psi. While they tend to be slightly more expensive, metal heads will be better able to handle the strain of higher pressures. Metal sprinkler heads are also more durable, meaning they'll last longer and experience fewer issues. If you're unsure which type of head will work best for your home, consult with a home improvement or gardening expert while you're shopping for an impact sprinkler system. A new sprinkler that has stopped performing to its usual standard may just be in need of a good cleaning. Remove the sprinkler head from the base and disassemble it to gain access to the nozzle and swivel bearing. Gently scrub each piece with hot water and a bottle brush to remove any debris or mineral buildup that may be inhibiting the sprinkler's movement. Common symptoms of a dirty sprinkler include a weak stream with normal water pressure, turning to one side and stopping, and failing to rotate at all. A mixture of vinegar and warm water can cut through heavy mineral and sediment deposits that have accumulated inside the sprinkler head.
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One-sentence summary -- Make sure you're using a water source with a pressure of at least 15 psi. Choose the right sprinkler head. Clean your sprinkler periodically.

Article: You can use new, clean, heat-treated pallets to make simple, neat raised beds. You can take the pallet apart to make a deep raised bed from the timber, or just lay one on the ground to make a shallow raised bed. Keep in mind that you won't be able to raise the bed too high with just one pallet, but it's a good start. Raised bed gardening means you don't need to bend down as much to tend plants, need to dig less and it really helps improve drainage. Ideally, you should start by eliminating weeds underneath where your raised bed will go. Try chemical controls, or lay down some newspaper or cardboard. You'll want to close up the edges of the pallet all round the narrow sides, to prevent weeds from poking through. To do this, you can nail thin planks around the 4 edges, or use strips of weed control fabric. Plant it up through the slats and water well. Because you are raising the bed very little, this method will work best for shallow-rooted plants such as lettuce and strawberry.
Question: What is a summary of what this article is about?
Decide what kind of raised bed you want to achieve. Eliminate any weeds and close up the edges of the pallet. Lay the pallet on the ground and fill with compost.