Clearer video for everyone! Or at least for some.

Netflix is now offering Super HD, its highest-quality streaming video, to all of its customers, the company announced in a blog post on Thursday, expanded from a limited rollout in January.

But some customers still might not be able to use Super HD all the time, because some Internet service providers haven't joined a network Netflix designed to keep Internet congestion low.

When Super HD was introduced in January, it was available only to people whose Internet Service Providers were using Netflix's Open Connect Network, a system of servers connected to local ISPs designed to help ease Internet congestion.

Netflix customers account for up to a third of Internet traffic at peak hours in the U.S., Netflix's vice president of Content Delivery, Ken Florance, explains in a video (which you can also watch below). Open Connect is supposed to ease the burden on the Internet.

But not every ISP has joined Open Connect. Which means that not every Netflix customer will be able to use Super HD all of the time. Customers of Time Warner Cable, for example, might have to watch slightly grainier video, and they may experience sluggish Internet speeds when Netflix viewing is high, VentureBeat points out.

In its post, Netflix says, "the ability to receive Super HD depends on broadband quality and performance."

Loading Slideshow...
  • Don't Watch A Movie Without Rating It

    When you finish a show or movie on Netflix, the site requests that you give it between one and five stars, based on how much you enjoyed it. You're not being asked to rate that content for kicks, or so that you can later reminisce about how much you liked a certain film: Rather, Netflix has spent many years improving its recommendation engine, even offering a $1 million prize for anyone who could up the accuracy of Netflix recommendations by 10 percent. At this point, the Netflix recommendation engine is pretty darn accurate -- it takes into account your own ratings as well as the viewing habits of those similar to you. Basically, the more films you rate, the more you're likely to enjoy a Netflix recommendation. If you constantly find yourself frustrated that there's nothing on Netflix, take a half hour or so and knock out a few hundred ratings on the "Taste Profile" section of the site, and make sure you've filled in your genre preferences, too. Finally, if Netflix persists in recommending a title that you're just never going to watch -- for me, that would be "The Lincoln Lawyer" -- remember that you can click on the "Not Interested" button on any film's homepage and it will disappear from your recommendations page while simultaneously smartening up your future recs. (For an in-depth look at the Netflix recommendation engine, and how it works, I recommend this post on Netflix's official blog.)

  • Don't Fly Blind

    Leaning on Netflix's recommendations alone ensures that you'll discover some good flicks; if you're really committed to shaking all the leaves from the tree, however, you're going to need some backup artillery. There are several excellent extensions that you can add to your favorite browser to augment your Netflix experience and increase your chances of sniffing out a great new film. An extension like "Rotten Netflix," for example, inserts little Rotten Tomatoes scores beneath every movie poster on the website, so that you can instantly know how a movie fared with critics. Similarly, the "IMFlixDB" extension displays a movie's IMDB ranking on a white bar above the Netflix homepage and gives you quick access to that film's information page. The ever-prodigious members at Reddit use the wisdom of crowds, meanwhile, to constantly vote up streaming movies that you might otherwise miss. It's a super-active community with consistently high-quality recommendations: Check it out here.

  • Don't Let A Film Disappear

    Another Netflix specialty website is InstantWatcher, a clean website that allows for easier movie search than you'll find on the Netflix homepage. And while many outlets toast InstantWatcher for its quick and robust search functionality, we like it because it also lists the notable films that will disappear from Netflix Instant soon. There's even a Twitter feed that does nothing but tweet out the names of soon-to-be-expired Netflix movies. There is no worse feeling, in the whole entire world, than sitting down to watch a movie you've had in your Netflix queue only to discover that the movie has disappeared. Don't let it happen to you again.

  • Don't Be Afraid To Quit

    One of the really nice things about a Netflix subscription is that you pay month-by-month; it's not like a cell phone contract where you're locked in for two years and you have to pay an exorbitant fee if you want to get out early or cancel service. With Netflix, you can quit for one month and come back the next: Netflix will save your queue and ratings for up to two years so that if you do come back, you don't really have to start over. So, if you're taking a vacation, or studying for the LSATs, or going to prison, just cancel your account and save yourself the $8 for as long as you need. Or, if you are one of our Olympian Netflix bashers from above, go ahead and try life without the 'Flix for a month or two and see how you do. Your account information will be waiting for you when (or if) you return; and, hey, if you do, now you have plenty of new ways to find the excellent movies and TV shows you might have missed while in exile.