DampRid is a popular moisture absorber often used in damp basements, closets, bathrooms and other areas prone to excess moisture. It contains calcium chloride, a hygroscopic compound that absorbs water vapor from the air. Over time, the calcium chloride in DampRid can harden and form solid clumps or chunks.
What causes DampRid to harden?
There are a few key reasons why DampRid may harden over time:
- Absorption of moisture – The main purpose of DampRid is to absorb ambient water vapor. As it absorbs moisture from the air, the calcium chloride undergoes a physical change and hardens.
- Low humidity – If the environment becomes very dry, there may not be enough moisture in the air for the calcium chloride to absorb. This can cause hardening.
- Temperature fluctuations – Changes in temperature can accelerate the hardening process. High heat tends to drive moisture out of the calcium chloride.
- Age – Over time, the calcium chloride will become fully saturated with water and harden. Older containers of DampRid are more likely to be hard.
Does hard DampRid still work?
Hardened DampRid can still absorb some moisture, but it becomes less effective over time. The hardening process is an indication that the DampRid has absorbed a significant amount of water vapor already. At this point, its moisture absorbing capacity is reduced.
One way to test if hardened DampRid still works is to leave it open in a humid environment. If the hard chunks or clumps begin to liquefy and dissolve, it means they are still able to absorb additional moisture. However, absorption will be slower compared to fresh DampRid.
Can you rejuvenate hardened DampRid?
It is possible to restore hardened DampRid to an absorbent state. Here are a few methods to rejuvenate hardened calcium chloride:
- Add a small amount of warm water – Adding a teaspoon or two of warm water will help liquefy hardened chunks. Allow it to fully absorb the water and return to its crystalline state.
- Microwave briefly – Microwaving hardened DampRid for 15-30 seconds can melt chunks and restore absorbency. Take care not to overheat it.
- Run under warm tap water – Placing hardened DampRid under warm running water allows the chunks to dissolve and become moisture absorbent again.
- Replace with fresh DampRid – For severely hardened products, it may be more effective to simply replace with new DampRid.
How to extend the life of DampRid
Here are some tips to keep DampRid working efficiently for as long as possible:
- Start with fresh containers – Old stock may be partially hardened already. Purchase containers with recent production dates.
- Keep it closed when not in use – Leaving the container open constantly will accelerate hardening.
- Store in a cool, dry place – Temperature and humidity fluctuations can shorten its lifespan. Keep it in a stable environment.
- Reuse only once – DampRid can be rejuvenated once. After that its absorption capacity is greatly reduced.
- Use it periodically – Rotate multiple containers to give each one a chance to recover.
When should I replace my DampRid?
Here are some signs it is time to replace your DampRid:
- The granules are fully hardened into rock solid chunks – No amount of rejuvenation will help at this point
- The color has changed from white to grayish/yellowish – This indicates it has absorbed a substantial amount of moisture
- There is obvious mold growth – Mold means moisture levels are too high
- The date code indicates it is more than 6-12 months old – Effectiveness declines with age
- The moisture level hasn’t improved – Your environment may require additional DampRid containers
Are there alternatives to DampRid?
Some alternatives to DampRid include:
- Silica gel packets – Silica gel absorbs moisture similar to calcium chloride. Often packaged with electronics or food.
- Activated charcoal – Charcoal filters moisture from air. Some dehumidifiers use activated charcoal.
- Crystals Cat Litter – The crystals in cat litter can absorb excess moisture.
- Perlite – This volcanic mineral soaks up water and is often used in potted plants.
- Rice – Uncooked rice grains naturally absorb ambient moisture in the air.
However, DampRid often works better than makeshift alternatives, since it is specially formulated for moisture absorption. The calcium chloride provides rapid absorption and large moisture capacity relative to its volume.
Frequently Asked Questions
Does DampRid expire?
DampRid does not officially expire for 18 months to 2 years after production. However, its effectiveness will begin dropping after about 6-12 months once opened. Unopened containers may last up to 2 years.
Can you put DampRid in the microwave?
Yes, you can briefly microwave hardened DampRid for 10-20 seconds to melt the solid chunks and restore moisture absorbency. Do not microwave for more than 30 seconds.
Is DampRid toxic to pets?
DampRid contains calcium chloride, which can be harmful if ingested by pets. It is not highly toxic but may cause gastrointestinal irritation. Keep DampRid containers out of reach of pets.
Does DampRid reduce oxygen?
No. DampRid only absorbs moisture and does not interact with oxygen levels in any way. It is safe to use in enclosed spaces without reducing oxygen.
How long does DampRid last?
An opened container of DampRid will effectively absorb moisture for 1-2 months. Unopened containers can last 6-12 months from the production date before absorbing capacity drops.
Conclusion
DampRid is an effective moisture absorbing product containing calcium chloride. It may harden over time as it absorbs water vapor from the air. Hardened DampRid can be rejuvenated but has reduced absorbing capacity compared to fresh product. Replace containers frequently for optimal moisture control. With proper care, DampRid can provide an easy solution for excess humidity in basements, storage areas, and other enclosed spaces.
