This is a popular myth, so it's well worth covering. The details may vary depending on where you hear it, but it goes as follows. First, you head down to your local supermarket, find the aisle with baking ingredients, and buy a box of Sure Gel (or another kind of pectin like Certo). While you're there, make sure you stock up on Gatorade as well, because you'll be drinking a lot of it.
When you get home, don't do anything quite yet. You'll need to wait until about 3 hours before your expected drug test time. When the time comes, you're supposed to mix a whole packet of Sure Gel (or Certo) with about 32 ounces of Gatorade and drink it. This will be rather thick and generally unpleasant, but hey, what can you do? Wash it down with about a gallon (yes, a gallon) of water.
It doesn't sound nice does it? But does Sure Gel work to pass a drug test? We don't think so, and we'll explain why? We'll also explain why many people think it does work.
So, does Sure Gel work to pass a drug test?
In general, no, at least in the sense that there's little point to ingesting that gooey mess.
Advocates of this method claim that the ample soluble fiber in Sure Gel binds with lipids that may contain traces of drugs. Obviously, this will only work with fat-soluble drugs like THC. The major problem here is that dietary fiber never leaves the digestive system. Sure it may manage to trap a few THC metabolites there, but most drug metabolites will be in your blood. These are filtered out by the kidneys and deposited in the urine.
So if this effect is negligible, how can it possibly work, at least for some people? To explain this, think about what would happen if you drank 32 ounces of Gatorade and a gallon of water? You would pee. In fact, you would pee a lot.
This can be a good thing, because it flushes drug metabolites out of your bladder temporarily, but it can also cause you to fail an adulterant test. You may not even get that far, because it will be obvious that your urine is too diluted for testing. If you're lucky, they may not be taking the tests too seriously and let you slide, which is probably why it works for some people.
Is there a better way?
If you don't feel like drinking goo and possibly still failing, why not get a good quality detox drink to use shortly before your test. This will trigger your urinary system to flush itself clean without the need to drink an unpleasant goo. They're also fortified with various vitamins and minerals to get you through the adulterant test.
There are many good detox drinks to choose from, but make sure you get one that's suitable for your body weight and level of use. By the way, if you really feel you want to try an approach with soluble fiber, get some psyllium husk supplements and take them with your detox drink. It's a lot easier than eating Sure Gel.