Hot tubs run at a temperature where many kinds of mold, bacteria, and other organisms can flourish and live in the inner workings. If you replace all the water without flushing the lines first, you risk contaminating the new water. You can keep your tub cleanest by regularly running special cleaner through its lines, a process called "flushing the lines," to eject and cleanse bacteria and gunk.  A line flush for your hot tube should be available at your local pool supply store, but may also be available at your local hardware store. Be sure you specify that you need a line flush for a hot tub, as many different kinds of line flush exist. Depending on the line flush you purchase, the procedure for application may vary. Generally, you'll add the flush to your hot tube while it is running for a period of time indicated in the instructions of the flush treatment. Lines that have build up can result in decreased jet pressure, cloudiness in the water, or increased pressure (and strain) on your pump motor. Flushing your lines will help your tub run smoothly and efficiently. Forgetting to cut power to your tub could result in its pump kicking on when there's not enough water, which could do damage to the motor of your hot tub pump and filter mechanism. To ensure your tub is completely off, you may want to go to the fuse box and flip the breaker for the circuit that's supplying it power to the "OFF" position. Turning off the circuit breaker as well as switching your tub to off can prevent others from accidentally turning it on if you take a break when cleaning or have to leave to pick up more supplies. A damaged pump can be an expensive and unnecessary expense. This should be done according to the directions that came with your hot tub. Most often this involves the use of a built-in sump pump or a drain plug to remove the water from the reservoir of your tub. Many manufacturers also recommend leaving the foot-well of your tub full of water. If flushing your lines has released a cloudy discharge into the water, you may have to completely empty your hot tub of water. After doing so, you should rinse your tub to remove any remaining line particles. Then you can fill the foot-well of your tub, if necessary.
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One-sentence summary -- Consider flushing the lines of your tub before draining. Turn off power to your hot tub. Drain the water in your tub.

Q: When you first see your cattle, honk your car horn in a certain pattern, ring a cow bell, or yell out a phrase or noise. You can also make these sounds when you feed your cattle, so that they’ll associate responding to you with food. Keep working at training until your cattle recognize your noise and respond to it.  In some cases, your cattle will learn to respond to your call in around a week. However, it might take longer, depending on the animals and your training methods. The most effective training approach combines consistency with an immediate reward, such as hay. For example, if you arrive at the paddock at the same time every day, ring a bell, and then give your cows hay when they respond, they’ll associate listening to your bell with food. Using electric cattle prods can actually make your cattle behave recklessly. Similarly, whips can also scare your cattle and make them not trust you. Instead, to encourage your cattle to move, apply gentle pressure with a plastic paddle or the sides of a broom.  A paddle is often a good idea because it is a wider tool and cattle can more easily track it. If you move slowly and carefully, then this can minimize their fear. Also, if you grab your cattle’ tails, do so carefully to avoid injuring them. Pulling or twisting their tails can actually cause breakage. Since cattle are herd animals, it can frighten them to be touched or moved around alone. When you need to treat or inspect an animal, separate it out with at least 2 others in tow. Similarly, if you notice a cow or bull becoming aggressive it could be because they are not comfortable in too small of a herd. If you are working with younger animals or calves, bring in a few mature cows to keep them calm. If you have a number of cattle or just need extra help, then reach out to others in the agricultural community for possible job candidates. Look for people who have worked with cattle before and who are familiar with how to care for them properly. Once you hired someone, spend some time observing them in the field. Request that your employees continue their cattle-related education by taking agricultural classes at the local college or even by watching instructional videos online.
A: Train your cattle to respond to particular sounds. Treat your cattle gently and without violence. Keep your animals calm by pairing them up. Hire only experienced cattle handlers.

Article: Tap the Camera app icon, which resembles a black camera on a grey background. Your phone should focus in on the QR code after a brief moment. If your front-facing camera is on, first tap the camera-shaped icon in the bottom-right corner of the screen to flip the camera to the main camera. All four edges of the QR code should be on your iPhone's screen. Once the QR code is centered on your iPhone's screen, it should scan almost immediately. Tap the Safari notification that appears at the top of the screen to open the QR code's webpage or other information.
Question: What is a summary of what this article is about?
Open your iPhone's Camera. Point the camera at the QR code. Make sure the QR code is centered on your iPhone's screen. Wait for the code to scan. Open the QR code's content.