DampRid is a tub or bag of calcium chloride crystals that pulls moisture out of the air without electricity. The crystals absorb water vapor, harden, then slowly dissolve into a salty liquid called brine that collects in the bottom of the container.
Once the crystals are gone it stops working, and you refill or replace it. One unit lasts from 45 days to 6 months, depending on its size and how humid the space is.
It suits small closed spaces like closets, bathrooms and stored RVs. It is not the right fix for every musty space, and a damp basement usually needs a dehumidifier instead.
Updated October 2026 against DampRid’s current instructions and safety data sheet.
| DampRid at a glance | The short answer |
|---|---|
| What it is | Calcium chloride crystals (80 to 100% by weight) in a vented tub or bag |
| How it works | The crystals absorb moisture from the air, harden, then dissolve into brine |
| How long it lasts | Up to 45 to 60 days for small tubs and hanging bags. Up to 6 months for the Hi-Capacity bucket |
| Space it covers | Up to 250 sq ft for a 10.5 oz tub. Up to 1,000 sq ft for the Hi-Capacity bucket |
| When to replace it | When all the white crystals have dissolved |
| Disposal | Pour the liquid down the toilet (refillable tubs), or put the whole unit in the trash (disposable tubs and bags) |
| Safety | Keep it away from children and pets. Do not swallow it. Avoid skin and eye contact |
What is DampRid?
DampRid is a product made up of calcium chloride crystals.
These crystals are housed in a specialized container that separates the hardened calcium chloride from the liquid brine that it becomes as it absorbs moisture.
Some products are available with added fragrances, and all come in a variety of sizes, from super-small car cartridges to extra-large buckets.
What is DampRid made of? Its safety data sheet lists 80 to 100% calcium chloride, plus 1 to 5% each of sodium chloride and potassium chloride. All three are salts.
Scented versions add fragrance beads, and the odor versions add activated charcoal.
Is DampRid Safe?
DampRid is advertised as all-natural and nontoxic. Its own safety data sheet is more careful: it classes the crystals as harmful if swallowed, a skin irritant and a serious eye irritant.
Used as directed, it is safe around the house. DampRid says its disposable tubs give off no vapors and are safe near food in a pantry.
Keep every tub and bag out of reach of small children and pets. If the crystals or the liquid do get on someone, DampRid’s instructions are:
- Eyes: remove contact lenses, flush with water for 15 minutes, then get medical attention.
- Skin: wash straight away with soap and water. Get medical attention if irritation continues.
- Swallowed: get medical attention immediately. Do not induce vomiting unless a medical professional tells you to.
If a pet gets into the crystals or the liquid, call your vet.
The label on DampRid’s disposable tubs also says to keep the product away from leather and metal. Wipe up any spilled liquid straight away.
Important Information on Calcium Chloride
Calcium chloride is a salt. Food makers add small amounts of a food-grade version to products like cheese, tofu and sports drinks.
That does not make DampRid safe to eat. Its instructions say do not ingest it, and avoid contact with eyes and skin.
However, the crystalline form of calcium chloride is much more dangerous than the DampRid nontoxic label lets on.
These crystals are highly reactive with water, which means if they come into contact with a moist surface, a chemical reaction occurs.
Even the water present in the skin can be enough to cause issues. These skin burns often occur without pain or immediate visual evidence but can lead to severe long-term damage.
Warning: Ingesting calcium chloride crystals is even more dangerous since the mouth, throat, and stomach contain high moisture. In these situations, an exothermic reaction can lead to severe burns of the mouth and esophagus.
When used according to the directions on the package, DampRid is safe.
However, if a child or pet gets ahold of a DampRid package, it wouldn’t take much to get the crystals out. This could quickly lead to a serious problem.
How Does DampRid Work?
Calcium chloride has hygroscopic properties. This means it actively attracts water molecules and both absorbs and adsorbs moisture.
These crystals will first absorb liquid into themselves. Once they are saturated with moisture, they will begin to adsorb, or hold, liquid on their surfaces.
Calcium chloride is so reactive with moisture that, in fact, it can pull enough water from the environment to dissolve itself completely.
Once the crystals have all dissolved in the liquid they’ve captured, the moisture removal process ceases. At this point, the DampRid package needs to be replaced for moisture control to continue.
DampRid describes the process in three stages: the crystals harden, the liquid drips, then you replace it.
How Long Does It Take for DampRid to Work?
It starts absorbing moisture as soon as you open it. You will not see liquid straight away.
DampRid says it can take a few days before the first drips reach the bottom chamber. In its large 5 lb refillable tub, that can take up to 2 weeks.
If the crystals have set into a hard lump, it is working. Do not chip them or break them up.
How Long Does DampRid Last?
It depends on the size of the unit. These are the figures DampRid publishes for each type.
| DampRid product | How long it lasts | Replace it when |
|---|---|---|
| Refillable tub, 10.5 oz | Up to 45 days per fill on DampRid’s site. Its Amazon listing says up to 60 | All the crystals have dissolved from the basket |
| Disposable tub, 10.5 oz | Up to 45 days | All the crystals have dissolved from the top of the unit |
| Disposable tub with charcoal, 18 oz | Up to 45 days on DampRid’s site. Its Amazon listing says up to 60 | All the crystals have dissolved |
| Hanging bag | Up to 60 days | The liquid reaches the replacement line |
| Hi-Capacity bucket | Up to 6 months | The crystals are gone and the dark absorber reaches the red arrow |
| Mega refillable tub, 5 lb | Refill about twice a year | All the crystals have dissolved from the tray |
Treat those as best-case numbers. DampRid says to expect a shorter life in high humidity or high temperatures.
Do not top up a refillable tub early. DampRid says adding crystals before the old ones dissolve can change how it absorbs, or damage the tub.
Do not empty the liquid early either. The brine keeps absorbing a small amount of moisture until the last crystal is gone.
How Much Space Does One DampRid Cover?
DampRid rates its tubs by floor area. Match the product to the space, not the other way around.
| Space | DampRid product to use | Rated coverage and notes |
|---|---|---|
| Closet or gym locker | Hanging bag | No square-foot rating. Hang it with room for air to move around the bag |
| Bathroom, laundry room or kitchen | Refillable tub, 10.5 oz | Up to 250 sq ft |
| Musty closet or laundry room | Disposable tub with charcoal, 18 oz | 250 sq ft on DampRid’s site. Its Amazon listing says about 300 |
| Basement, garage or storage unit | Hi-Capacity bucket | Up to 1,000 sq ft |
| Stored RV, camper or boat | Hi-Capacity bucket or a disposable tub | Set it where it cannot tip over. Small leaks are possible |
| Parked car | Disposable tub under a seat | Keep the windows and sunroof closed. The label says not to use it in a moving vehicle |
| Gun safe | Not listed by DampRid | The label says to keep the product away from metal and leather |
DampRid only absorbs moisture from the air, not standing water, and each unit holds a fixed amount of crystals. A bigger or wetter space uses them up faster.
For a car, DampRid suggests a disposable 10.5 oz tub under one seat while the car is parked.
DampRid does not list safes among its uses. Its label warns against contact with metal and leather, and a tipped tub can leak, so a gun safe is a poor fit.
Does DampRid Actually Work?
The scientific reasoning behind how DampRid works is sound, but how does this product actually perform in terms of removing moisture from your home?
The answer to this question really depends on how you plan to use the product.
All DampRid products, no matter the size, can only attract a finite amount of water. Once all of the crystals have turned to brine, you must replace them to keep seeing the benefits.
If you’re using DampRid to control high natural humidity levels in your home, you’re going to go through a lot of this product.
In this case, a dehumidifier is a much better option.
However, DampRid products can be very handy for short-term situations, such as after a leak or flood.
Even there it has limits. DampRid itself says its products absorb moisture from the air only, not standing water, and suggests adding an electric dehumidifier for extra drying after a storm.
DampRid vs Dehumidifier
In our opinion, both DampRid and dehumidifiers have their place in the home. Each has benefits and drawbacks that the other doesn’t. And, most importantly, each works best in different situations.
| Feature | DampRid | Dehumidifier |
| Benefits | Requires no electricity, requires no upkeep while in use, starts absorbing moisture as soon as it is opened | Can be used continuously for humidity control, should last for years, humidity level can be set to desired range, works well even in stagnant rooms |
| Drawbacks | Only removes moisture from the air that is touching the product (requires fans for optimal performance), must be replaced constantly, can easily be overwhelmed during wet weather or continuous leaks, safety concerns with children and pets | Requires electricity, water reservoir must be connected to drain or emptied frequently, requires occasional upkeep |
| Achievable Humidity Level | No humidity setting. It absorbs until the crystals run out. DampRid says it will not dry the air enough to harm plants, pets or clothing | Target humidity level can be set to desired range or will default to 40 to 60%, which is considered optimal for comfort |
| Optimal Situation for Use | To remove excess humidity after leaks or floods, or maintenance for small musty areas like closets and crawl spaces | For continuous humidity control in the home or basement, or targeted humidity control in the bathroom |
It’s worth noting that a quality dehumidifier can also be used in many of the same situations that DampRid is optimized for. If you already have a dehumidifier, you can save money by using it in place of DampRid.
If you don’t have a dehumidifier and are considering getting one, you can learn more about how they work here.
If you would rather buy one small machine than keep replacing tubs, the Midea Cube 20 Pint is the small-room pick on both our best dehumidifiers for basements and quietest dehumidifiers lists.
Midea Cube 20 Pint Dehumidifier
- Removes up to 20 pints of water a day, rated for 1,500 sq ft
- Set a target humidity anywhere from 35% to 85%
- 3.2 gallon bucket, or drain it through the included hose
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What Can DampRid be Used For?
We’ve looked at the optimal uses for DampRid in terms of moisture control, but other situations may benefit from the use of this product, as well.
Moisture Absorber
A bucket of DampRid can quickly become your best friend after a spill or overflow situation. It absorbs excess moisture from the air, not standing water, so mop up first.
Drying the space quickly helps you avoid mold growth. Just be sure to use fans in the space to help push moist air toward the product.
Dehumidifier
If a dehumidifier is off the table due to budget or other constraints, you can use DampRid. Just be aware that you will have to replace the product often as it stops working once all the crystals have turned to brine.
Also note that it has no humidity setting, so you cannot pick a target level the way you can on a dehumidifier.
If money is an issue, you may consider purchasing a small dehumidifier for use in the rooms you spend the most time in. Most likely, you’d spend just as much on DampRid over the wet season as you will on one of these products.
Odor Control
Some DampRid products come with fragrance beads or charcoal to help cover up or eliminate foul odors. These suit rooms that smell musty after a leak, or any room prone to odor.
Does DampRid Prevent Mold?
In theory, DampRid can help prevent mold.
The EPA advises keeping indoor humidity below 60%, and ideally between 30% and 50%, to stop mold growing.
DampRid does not publish a humidity level its products reach, so it only helps if two things are true.
First, the product needs to be switched out as soon as it becomes saturated and stops working. And second, you’ll need to use fans to circulate the air in the room to assure pockets of moisture don’t occur and give mold a place to thrive.
It will not remove mold that is already growing. For that, see our guide to removing mold from drywall.
If you have a damp basement, you can try many other options to reduce humidity levels and prevent mold growth. Check out our article, How to Get Rid of Humidity Without a Dehumidifier for some great ideas.
Can DampRid Fix a Damp Basement?
Not on its own. DampRid suits small closed spaces, and a damp basement is usually neither small nor closed.
DampRid does list basements for its Hi-Capacity bucket, which is rated for up to 1,000 sq ft and lasts up to 6 months.
But it only absorbs moisture from the air, it holds a fixed amount of crystals, and it has no humidity setting. Once the crystals dissolve, it stops.
A dehumidifier keeps pulling water for as long as it is plugged in. Even the small Midea Cube above is rated for 20 pints a day.
So use DampRid for the closed spots inside a basement: a storage closet, a cupboard or a stored camper. Use a dehumidifier for the room itself.
If the dampness comes from leaks, gutters or the ground outside, fix that first. Our guide to getting rid of basement humidity without a dehumidifier covers those fixes.
Ready for a machine? See our best dehumidifiers for basements, or the quietest dehumidifiers if it will run near a living space.
What Sort Of DampRid Should You Buy?
There are four DampRid products we recommend. This table shows which one fits which space.
- Best use Basements, garages, stored boats and RVs
- Coverage Up to 1,000 sq ft
- Lasts Up to 6 months
- Best use Bathrooms, laundry rooms and kitchens
- Coverage Up to 250 sq ft per tub
- Lasts Up to 45 to 60 days per fill
- Best use Closets, laundry rooms and gym lockers
- Coverage One closet (no sq ft rating)
- Lasts Up to 60 days per bag
- Best use Musty closets, laundry rooms and stored RVs
- Coverage 250 to 300 sq ft per tub
- Lasts Up to 45 to 60 days per tub
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All four were in stock on Amazon when we checked in October 2026. Each one is covered in more detail below.
DampRid Bucket
- Hi-Capacity bucket for basements, garages and stored boats or RVs
- Rated for spaces up to 1,000 sq ft, and lasts up to 6 months
- Take the lid off, leave the safety cover on, and keep it away from pets and children
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DampRid buckets are high-capacity moisture absorbers. DampRid rates them for spaces up to 1,000 sq ft.
They suit basements, garages and storage units, and they help dry the air after a leak. If you’re wondering how to use a DampRid Bucket, here’s how:
- Set the product near the problem area
- Remove the lid and leave the sealed safety cover in place. Be sure no pets or children have access to the tub.
- Once all the crystals are gone, toss it and replace it if needed.
DampRid Refillable Moisture Absorber
The DampRid Refillable Moisture Absorbers are basically a smaller version of the bucket and are ideal for small rooms.
Each one is a 10.5 ounce cup rated for areas up to 250 sq ft. DampRid’s site says a fill lasts up to 45 days, and its Amazon listing says up to 60.
When the crystals are gone, pour out the liquid and refill the same cup.
- Four 10.5 oz refillable tubs, fragrance free
- Each tub is rated for areas up to 250 sq ft
- Refill with new crystals once the old ones dissolve
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To use a DampRid refillable moisture absorber:
- Remove the lid and open the top of the bag containing the crystals
- Pour the crystals into the canister (in the holder basket)
- The crystals will harden and dissolve as they absorb moisture in the air
- When the crystals have dissolved, empty the liquid into the toilet and add a refill
Hanging DampRid
- Three 16 oz bags, each with a built-in hook
- Made for closets, laundry rooms and gym lockers
- Each bag lasts up to 60 days, and hangs out of reach of pets and children
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Hanging DampRid products come in bags of 14 to 16 ounces, with a hanger-style hook on the top so you can hang them from a closet rail.
These are perfect for closets and laundry rooms. Hang each bag with enough space for air to move around it.
These are the best choice if you have pets or children since they can easily be placed out of reach.
DampRid With Activated Charcoal
- Three 18 oz tubs with a layer of activated charcoal
- Absorbs moisture and removes musty odors
- Good for closets, laundry rooms or near a litter box
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DampRid odor absorbers have an added layer of activated charcoal that helps remove odors from the air as moisture is absorbed into the product.
These make a great addition to rooms after leaks to help with lingering smells or for use in closets, above the litter box, or any other space that could use some freshening up.
DampRid FAQ
When should you replace DampRid?
Replace or refill it when all the white crystals have dissolved. On a hanging bag, that is when the liquid reaches the replacement line.
Why does DampRid harden or clump?
Hardening into a solid mass is a normal part of how the crystals absorb moisture. DampRid says not to break up or chip them.
Ice-like crystals in the bottom chamber come from a sudden change in temperature or humidity. In a refillable tub, run water over them until they dissolve.
Should you empty DampRid before the crystals are gone?
No. DampRid says to leave the liquid until every crystal has dissolved, because the brine keeps absorbing a small amount of moisture.
What is the liquid in DampRid, and how do you dispose of it?
It is brine: the water the crystals pulled from the air, with the calcium chloride dissolved in it.
For a refillable tub, pour it down the toilet or a running sink. DampRid says it is septic safe.
Disposable tubs and hanging bags go in the trash whole. Do not cut them open, and hold a hanging bag upright as you carry it.
Is DampRid toxic to pets and children?
DampRid calls its crystals all-natural, but its safety data sheet lists them as harmful if swallowed and irritating to skin and eyes.
Keep it out of reach, and choose a hanging bag if you have pets or small children.
Is DampRid safe in a bedroom?
Yes. DampRid lists bedrooms among its uses and says the product does not emit any vapors.
Put it where it cannot be knocked over, out of reach of children and pets.
Does DampRid remove odors?
It removes the musty smell that comes from damp air. For stronger smells, the version with activated charcoal absorbs odors as well as moisture.
Can you use DampRid in a basement?
Yes, for a small closed area, using the Hi-Capacity bucket. For a whole damp basement you need a dehumidifier. See the basement section above.
DampRid, the Right Solution in the Right Situation
DampRid effectively removes humidity from the air but is best used in only certain situations.
To help dry the air after a leak, DampRid is a cheap and easy choice. It can also be a good option for freshening up musty closets and dealing with moisture in a pinch.
Just be sure to keep this product out of reach if you have pets and children.
In most other situations, especially for continuous moisture removal, a quality dehumidifier will be a better investment.
Still have questions about when and how to use DampRid or a dehumidifier? Let us know by commenting below.
for the small buckets of damp rid do you only remove the packaging or do you also remove the material actually covering the crystals too. We do not notice any liquid in the bottom after a week of use.
You need to remove the seal covering the crystals too.
Hi Aaron. Thank you for the helpful info. I don’t know if you are still monitoring this post, but I was wondering if the Damp Rid actually draws water into the bucket it comes in, or if the crystals that dissolve could somehow overflow onto the floor of the room they are in? This may be a silly question, but I put a Damp Rid Bucket in a space that I can’t check on for another month, so I don’t want anything to overflow and ruin the floor it is sitting on. Thanks!
Hi Jill, the water does sit in the bottom of the bucket. But it will never collect so much that it overflows.
when the bottom bag is almost full of liquid and the top still has a great deal of crystals-is it still working or do i need to replace it?
I have damp rid hanging packages in my closets and have been working great till one bag broke and was all over the closet. Once broken, does the fluids ruin rugs, floors and clothes? Cant seem to fully get product removed.
You could try using some vinegar, or lots and lots of water.
I had a major leak in my house. I placed several small containers which absorbed the moisture. How do I get the hardened crystals out of the bottom. They are as hard as a rock.
Turn the tub over and give them a good whack! Should pop out as a whole.
Thanks for your research! Very helpful.
Very useful information. Although how should it be used in a pantry or around food.