Sub Solution Synthetic Urine Review – Uboxing & How to Use it to Pass a Drug Test

Daniel Miller
Daniel Miller, Ph.D Pharmacology, Drug Testing Specialist

Last updated on 2024 Jul 13

Sub Solution is a synthetic urine designed to mimic human urine for passing drug tests.

In this review, I’ll unbox the kit, discuss its advantages and disadvantages, and show you how to use it to pass a drug test.

sub solution synthetic urine contents

Sub Solution is ideal for those familiar with synthetic urine. It suits those who know how to discreetly carry and maintain the temperature of fake urine using body heat.

Unlike some products, it lacks a built-in heating system, so you’ll need to plan how to keep the urine warm.

However, it includes a heat activator powder that quickly heats the urine. While its features might be limited for beginners, experienced users will find it valuable and cost-effective.

What’s in the kit

I ordered this kit from the TestNegative website, the official seller of the Sub Solution. It arrived the next day in a plain, discreet box that gave no indication of its contents.

Inside the box, you’ll find:

  • Powdered synthetic urine vial
  • Heat activator powder
  • Mixing container with spout cap
  • Detailed instructions

Let’s delve into these components.

The urine

Sub Solution’s synthetic urine is among the most advanced formulas available – it will pass both the drug test and the urine validity test.

sub solution powdered urine vial

The urine looks, smells, and foams like real human urine, ensuring it passes the initial visual check at the lab.

sub solution synthetic urine dissolved in water

It’s important to note that new technology has emerged to detect synthetic urine, as detailed here: Synthetic Urine Detection.

This technology is inexpensive and identifies low-quality synthetic urines. I’ve personally tested Sub Solution with Synthetic UrineCheck strips, confirming its effectiveness.

The urine is unisex, suitable for both male and female use. It’s in powdered form, so you’ll need to mix it with water.

You can prepare the amount you need and store the rest in a drawer. No freezing is necessary, which is convenient.

Each kit contains enough urine for two uses, allowing you to pass two drug tests.

You need to be careful when trying to get urine powder from the vial because it often clumps together. Before opening it, tap the vial with your finger. This will loosen the powder, allowing you to pour out just half of it easily.

sub solution dropped into the cup as one piece

The flip-up spout cap

This cup is a great option.

Picture this: You’re in the drug testing bathroom, feeling nervous—as everyone does there. You’d typically need to unscrew the cap, pour the required amount of urine into the testing cup, and then screw the cap back on.

That’s a lot to manage when you’re anxious. Hands can shake, and I know several people who accidentally dropped the bottle and spilled the urine. To prevent this, the flip-up spout cap is great. You just need to flip it open with one finger, pour the urine, and then flip it back down.

sub solution cap

It’s that simple. Plus, it’s spill-proof, so it won’t accidentally spill in your pocket or wherever you hide it.

Urine bottle

The urine bottle is leak-proof, so no worries about spills in your pocket. Its small size makes it easy to hide on your body—between your legs, in the crotch, or in a bra—and sneak into the testing facility.

A temperature strip is attached to the bottle, letting you easily check if the urine is at the required temperature.

sub solution synthetic urine bottle with temperature strip

Heating powder

This special heating powder heats the liquid once added to it. It’s handy when you quickly need to bring the urine up to body temperature.

sub solution heat activator powder

Just add one-third of the powder to the urine bottle and gently shake it. It takes about 10-15 seconds to warm up, perfect for quickly heating the urine and then keeping it warm with heat pads. You might wonder, “Daniel, how am I supposed to use this in the drug testing bathroom?”

Exactly, and that’s one of the downsides.


The heat activator powder isn’t very easy to use. You need to measure it precisely to avoid overheating the urine. Though it’s supposed to heat the urine quickly, it can take several minutes because you must measure and add just a small portion.

This process can be tricky. I don’t recommend using the heat activator powder in the drug testing bathroom.

In such a stressful situation, it’s too difficult to use correctly and easy to make mistakes. There’s no measuring spoon provided, which adds to the challenge.

Instead, you might want to use heat pads or keep the bottle close to your body to use body heat to keep the urine warm. I’ve explained all the methods to keep urine warm in my article: How to Keep Fake Pee Warm for a Drug Test.

Another downside is that the urine is in powdered form. While not a major downside, it requires mixing with water, taking about 5-10 minutes, which can be problematic if you’re in a hurry.

While the manufacturer suggests using tap water, I recommend against it. Use clean bottled water instead, as tap water may contain chemicals that could cause the urine to fail the validity test.

You don’t want that.

Lastly, you still need to find a way to discreetly bring it into the drug testing facility. You can tuck it into your groin area or tape it to your leg.

Alternatively, you could use a stash leg belt, but that’s an additional cost.

How to use Sub Solution to pass a drug test

First, you need to prepare the urine. The synthetic urine can be mixed with water up to eight hours before use.

Remove the screw cap from the bottle and fill it with room temperature water (59°F to 77°F), just below the top. The water shouldn’t be too hot or too cold. I recommend using clean bottled water instead of tap water.

Don’t discard the cap, and don’t open the synthetic urine vial until you’re ready to use it.

Add the entire contents of the synthetic urine vial to the water in the mixing container. Screw the cap back on the bottle and gently shake the container until the powder has completely dissolved.

Now, your urine is ready.

Now I’ll describe how to warm it with the heat activator powder.

Word of caution: You could use it in the drug testing bathroom, but I don’t recommend it. People are always nervous there, and hands can shake—a lot of factors can lead to mistakes. Since you need to carefully measure the heat powder, you can easily fail in such a stressful situation.

Another point is that you need to hide it on your body. Thus, I recommend using the heat activator powder for faster preheating before going to the drug test.

Using heat activator powder

For easy pouring, make sure the heat activator is loose or free-flowing. If the granules are clumped, just tap the vial against a hard surface to break them down.

Here’s how the heat activator works: The cooler the solution, the more heat activator you’ll need. But be cautious with the amount you use—you must avoid overheating the solution.

If the temperature strip shows below 88°F, carefully add one-third of the heat activator to the mixing container. If it reads between 88°F and 92°F, add only one-fourth.

It’s very rare to need more than half of the heat activator without risking overheating! If the solution goes above 102°F, let it cool by placing the container on a cold surface with the temperature strip facing up. Wait for it to drop back into the safe range of 94°F to 100°F.

After adding the heat activator, replace the cap and gently shake to dissolve it, usually taking less than 20 seconds. Check the strip again to make sure it’s within 94°F to 100°F.

Add more activator if needed.

I used two-thirds of the heating powder and about 20 seconds to raise the urine temperature to 95°F using the heating powder.

sub solution temperature strip reading

However, I used all the powdered urine to make 1.5 oz of urine. If you only need to make 1 oz, you’ll probably use less powder.

The temperature strip on the Sub Solution bottle is quite accurate; it shows 94-96°F, while my infrared thermometer reads 95.1°F.

sub solution temperature strip test with infrared thermometer

From my experience, using the heating powder isn’t very convenient, and it would be difficult to manage this in a drug testing facility bathroom.

Next, you need to hide the bottle on your body

Remember, you’ll have to empty your pockets and remove unnecessary clothing before the drug test. If the collector sees anything unusual, you might be observed directly while submitting the sample. So, don’t put the bottle in your pocket.

The most common method is to place it in your underwear in the crotch area.

Alternatively, you can use a special stash leg belt or stash trousers for more convenience.

stash leg belt

Never let the container’s temperature strip touch your skin, as this may give a false reading. For a really discreet option, consider the Incognito Belt.

When you enter the drug testing bathroom, carefully take out the bottle with the fake urine.

Check the temperature strip; it should read between 90°F and 100°F. Stay calm to avoid any spills.

Flip open the spout cap, pour the contents into the testing cup, and then hide the bottle again. That’s it, hand the cup over to the drug test collector.

Quick Fix vs Sub Solution

quick fix plus contents

Sub Solution stands out with its premium urine quality.

Quick Fix’s formula includes urea and uric acid, the right proportion of creatinine, and is balanced for pH and specific gravity.

It looks like urine and is decent enough under normal scrutiny, but it may not hold up as well under lab validity tests.

The heating method for Quick Fix is a heat pad, which can take up to 30 minutes to raise and maintain the temperature. The price is attractive, making Quick Fix a good option if it’s the only one available or you need something locally.

Comparing the two, if budget isn’t a constraint, Sub Solution would be the go-to choice for its superior quality.

However, for those on a tighter budget or in need of a quick local purchase, Quick Fix is a viable option.

Where to buy

The only place I recommend buying Sub Solution from is the Test Negative website. Purchasing it from the official Clear Choice store ensures you get the best price and a genuine product. I’ve seen many counterfeit Sub Solution and Quick Luck products on sites like Amazon and eBay, and it’s concerning.

Using a fake product could result in failing your drug test. Sub Solution costs $95, and there’s truth to the saying, “you get what you pay for.”

If you need the most reliable fake urine to increase your chances of passing a drug test, this is your best bet. If it’s just for a low-stakes, part-time job and money is tight, you might consider a cheaper option like Quick Fix.

However, for crucial tests where it really matters to avoid detection of substances in your system, Sub Solution is the product to seriously consider.


I recommend Sub Solution as a great choice for those experienced with synthetic urine, who can keep it warm using body heat and have a discreet way to carry it. It’s a reliable purchase at a good price. If you need a comprehensive solution, consider the Incognito Belt as well.


Does Sub Solution really work for passing drug tests?

Yes, Sub Solution is designed to effectively mimic human urine and pass drug tests. It is formulated to look, smell, and foam like real urine, ensuring it passes the initial visual check at the lab. When used correctly, Sub Solution has a high success rate in passing drug tests.

Are there any risks of using heating powder with Sub Solution?

Using the heating powder included with Sub Solution can be tricky, especially under the stress of a drug testing environment. Incorrect measurement can lead to overheating the urine, which could potentially jeopardize its effectiveness. It's crucial to follow the instructions carefully and practice beforehand to avoid mishaps.

Can synthetic urine be detected as fake by modern drug testing methods?

While low-quality synthetic urines can be detected by new technologies, Sub Solution is designed with an advanced formula that passes both drug and urine validity tests. It has been tested with Synthetic UrineCheck strips and confirmed for its effectiveness, making it a reliable choice against most modern testing methods.

What is the likelihood of Sub Solution failing a drug test?

Sub Solution is unlikely to fail a drug test as long as it is submitted at the correct temperature. The main reason for failure could be incorrect temperature, so it is essential to use the heat activator powder correctly and ensure the urine is within the required temperature range of 94°F to 100°F before submission.

How does Sub Solution compare to other brands like Quick Fix?

Sub Solution is known for its premium quality and effectiveness, surpassing many other brands like Quick Fix. While Quick Fix is more budget-friendly and adequate for less critical situations, Sub Solution offers a superior formulation that is more reliable for important tests, making it the preferred choice if budget is not a constraint.

What should you do if the synthetic urine is too hot or too cold at the time of the test?

If the synthetic urine is too hot, allow it to cool down by exposing it to a cooler environment until it reaches the safe temperature range. If it is too cold, carefully add a small amount of the heat activator powder to increase the temperature. Always check the temperature strip to ensure it's within the 94°F to 100°F range.

How discreet is the packaging and delivery of Sub Solution?

Sub Solution is delivered in plain, discreet packaging with no indication of its contents. The packaging and delivery method are designed to ensure privacy and confidentiality, making it easy to receive without drawing attention to the nature of the product.