Article: It's a square icon with a half-light blue and half-dark blue smiley face. Alternatively, simply click on your desktop wallpaper. It's at the top of the screen. Alternatively, you can press Shift++U. A terminal window will open.
Question: What is a summary of what this article is about?
Click the Finder icon in your dock. Click Go in the menu bar. Click Utilities. Scroll down and double-click Terminal in the Utilities window.
Article: Ultraviolet (UV) lamps designed for pools can neutralize most germs. They cannot keep a pool safe on their own. However, they will let you reduce the amount of free available chlorine (FAC) as low as 1ppm, or even lower under some regional laws. They can also break down some of the irritating or dangerous substances that show up in a chlorinated pool. Finally, although not normally used for this purpose, some types may break down existing high levels of chlorine. Local health codes may have different requirements. A "MP" UV lamp is a versatile option with the following benefits: This is the only common lamp that will break down a significant amount of existing chlorine. Even then, you'll need a dose 1020 times higher than the amount recommended for disinfection. This will probably require multiple lamps. This is the most effective lamp for breaking down chloramines, the substances usually responsible for stinging eyes, irritated skin, and "chlorine" smell. This lamp is fairly good at disinfecting, but not the best option. This type of lamp, often called a purifier, has excellent disinfecting ability, though you will still need to use (reduced) amounts of chlorine. This may make it an attractive option for public pools. These lamps also tend to be cheaper and longer-lasting than MP lamps. Advertisements may claim these lamps remove chloramines. This is partially true, but in practice they may or may not reduce the obvious signs, such as stinging eyes. There are a few other kinds of UV lamps, although they are less common. Here's some information to help you figure out what each product does: "Ultraviolet" actually includes a wide range of light with different effects. It is usually divided into UV-A (315400nm), UV-B (280315nm), and UV-C (100280nm). You should be able to find either the light type or a range of wavelengths (such as 245nm) for any product. Only UV-C light helps disinfect pools. Only UV-A light (including UV light from the sun) breaks down significant amounts of chlorine. Even then, it will take an intense amount of light. All three types help break down chloramines. Hiring a professional to install the UV system is recommended. Once installed according to specifications, very little maintenance is required. Continue to test your pool for chlorine as usual, keeping it at 1ppm or another low level as recommended by your product or local law.
Question: What is a summary of what this article is about?
Understand UV disinfection. Try a Medium Pressure UV lamp. Consider a Low Pressure UV lamp. Evaluate other types. Test the pool after installation.
Article: Plug one end of your iPad's charger cable into a USB port on your computer, then plug the other end of the cable into your iPad. Its app icon resembles a multicolored musical note on a white background. If iTunes lets you know that there's an update available, first click Download iTunes and wait for the update to install. You may have to restart your computer before proceeding. If iTunes asks you to enter your passcode, you'll need to use recovery mode to wipe your iPad. You'll find this iPad-shaped icon in the upper-left side of the iTunes window. Doing so opens your iPad's page. If this is your first time connecting the iPad to iTunes, you may have to click Trust iPad and tap Trust This Computer on your computer and iPad respectively before continuing. It's in the "Backups" section. This will prompt your iPad to begin backing up to your computer; this process can take several minutes. If prompted, you might first have to click Transfer Purchases to copy any purchases music, shows, and/or apps onto your computer as well. This option is in the upper-right corner of the iPad's page. If prompted to turn off Find My iPhone, you'll need to use recovery mode to wipe your iPad instead. Doing so will cause your iPad to begin restoring itself to factory settings. If you're prompted to click Restore and Update instead, you'll have to click Next and then click Agree when prompted before you can continue. This process can take upwards of half an hour to complete, so be patient. Do not unplug your iPad or turn off your computer at any point during the restore. Once you arrive at the "Apps & Data" page on your iPad, you'll be able to select a backup option. To get to this page, you'll need to select a language, a region, and a Wi-Fi network. It's near the top of the "Apps & Data" page. If you have an iCloud backup available, you'll instead tap Restore from iCloud Backup. Type in your Apple ID email address and password, then tap Next to start the backup restore. Once the backup finishes restoring, you should be able to unlock your iPad by pressing the Home button, after which point you can set a new passcode. Once you've restored your iPad's backup and you're logged back into your iPad, you can disconnect it from your computer.
Question: What is a summary of what this article is about?
Connect your iPad to your computer. Open iTunes. Click your iPad's icon. Click Back Up Now. Click Restore iPad. Click Restore when prompted. Wait for your iPad to finish restoring. Follow the on-screen prompts to the "Apps & Data" page. Tap Restore from iTunes Backup. Enter your Apple ID credentials.