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Fact #1. Before there were shower heads or showers, there were waterfalls. These were a great way for humans to get clean where access to clean water made bathing more of a challenge. While they didn't technically have showers, ancient Egyptians had no shortage of slaves. These folks were often employed in pouring water over their masters in a kind of manual showering ritual.
Fact #2. It wouldn't be until the late eighteenth century that a Londoner would invent a mechanical shower that operated by hand pump. These caught on quickly, as they used less water. By the time indoor plumbing became a widespread luxury, more homes connected freestanding showers to their incoming water lines. The modern water heater made the shower an even more heavenly place than it had been up to this point. Today, the United States alone burns through nearly six trillion gallons of fresh water in our showers every year.
Fact #3. Some shower heads employ air intakes and smaller ejection sites to increase water pressure from a trickle to a firm spray. They operate similarly to the choke on an engine. Increased air presence in the water flow will increase the sense of observed pressure. There's no combustion going on in your shower, but the principal is the same.
Fact #4. There are some models of shower heads with additional features, like detachable hoses or built-in radios. These operate in much the same way as any other version, but with an extra piece of hardware that takes up more space in your shower stall.
Fact #5. It's important for you to evaluate preferences in the shower. This is so you can base your decision on the way you want the water to hit you. The more popular style of late is the shower head with a wider surface area. This can most effectively recreate that rainfall feeling. The water from these heads wraps you up like a blanket and is ideal for the comfort shower.