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It can be helpful to open one or two faucets before turning on the water main again. Turning off the main shut-off valve will introduce some air into your pipes. Having at least one faucet open should allow the air to clear as the water refills the pipes. Try to open faucets far from the main shut-off valve and on the highest floor of the house.

Vinegar could damage drain pipes in theory since it’s corrosive in large quantities. However, you would have to pour a whole lot of vinegar down the drain at regular intervals to cause any issues. Adding a bit every now and then to clear out clogs is fine.

According to the EPA, there is no safe level of lead in the blood, and so the maximum contaminant level goal (MCLG) for lead in water is zero. Even at low levels, lead is harmful to human health. It can also remain in the body and build up over time with repeated exposure.

A back pressure valve is a control valve used on production vessels, such as separators, treaters, and free water knockouts. The valve holds pressure until a set point is reached, and then releases upstream pressure to reset. Back pressure valves are not safety mechanisms. Instead, they are regulators designed to keep the fluid, gas, or liquid mixture in a system at a certain pressure level to prevent bursts and other incidents.

Meanwhile, a backflow preventer is a safety mechanism that kicks in when the pressure has already failed and contaminated water flows in the reverse direction. Most backflow preventers consist of two one-way valves, or check valves assembled together. This design only allows water to pass through in one direction but not the other.