Moisture in the home can cause damp smells, mould growth, and damage to furniture or clothing. Many households in Australia turn to a moisture absorber as a simple way to control humidity indoors. But do moisture absorbers really work, and when should you use them instead of a dehumidifier?
This article explains how moisture absorbers work, their benefits and limits, and what research from Australian organisations says about their effectiveness.
How Do Moisture Absorbers Work?
Moisture absorbers use hygroscopic materials. Hygroscopic means the ability to attract and hold water vapour from the air.
The most common materials used in moisture absorbers are:
- Silica gel – tiny beads with many pores, giving them a large surface area to trap water vapour.
- Calcium chloride – a salt that dissolves when it absorbs water, forming a liquid solution that pulls in even more moisture.
- Activated charcoal – works by adsorption (molecules stick to its surface), which can reduce humidity and filter smells at the same time.
? You can find a variety of moisture absorbers and silica gel packets available on MedCart Australia.
Do Moisture Absorbers Work?
The short answer: Yes, they do – but only in the right situation.
In a review by CHOICE (Australia’s consumer advocacy group), a popular brand called DampRid reduced humidity from 80% to 43% within three days inside a sealed small space. It also collected almost half a cup of water (CHOICE, “Does DampRid Really Work?”).
However, CHOICE also found that even the weakest dehumidifier removed five times more moisture per hour than DampRid. The best dehumidifiers removed over 300 times more.
So, while moisture absorbers do work, they are best used in:
- Wardrobes
- Cupboards
- Storage boxes
- Small bathrooms
- Cars or boats
For bigger rooms or homes with serious damp or mould problems, a dehumidifier is far more effective. You can explore dehumidifiers on MedCart for whole-room protection.
Can Moisture Absorbers Prevent Mould?
Yes, moisture absorbers can help reduce the risk of mould.
Mould needs water to grow, and when indoor humidity is higher than 60%, mould spores thrive. By lowering humidity, moisture absorbers make the air less favourable for mould growth.
They also reduce condensation on windows and walls, which is another common source of mould.
⚠️ Important Note: If you already have mould in your home, a moisture absorber will not remove it. You’ll need to use proper mould remover products or professional cleaning. After that, a moisture absorber can help prevent mould from coming back.
Moisture Absorber vs Dehumidifier: What’s the Difference?
Both moisture absorbers and dehumidifiers remove moisture from the air, but they are very different in how they work.
If you only need to freshen up small areas, a moisture absorber works well. But if you’re struggling with persistent damp, leaks, or ongoing mould, invest in a dehumidifier.
What Is the Best Thing to Absorb Moisture in the House?
- For small areas – silica gel and calcium chloride work well.
- For larger rooms – dehumidifiers are the most effective solution.
- For cars or storage boxes – small disposable packs are enough.
If you’re unsure, try starting with a moisture absorber in smaller problem areas. If the problem spreads or persists, step up to a dehumidifier.
Other Ways to Prevent Mould
Moisture absorbers aren’t the only way to fight mould. You can also:
- Improve ventilation (open windows, use fans, install exhausts in bathrooms and kitchens)
- Fix leaks in plumbing or roofing
- Use mould remover sprays regularly in damp areas
- Wipe away condensation on windows and surfaces
- Use insulation to reduce cold spots where condensation forms
- Keep indoor humidity between 40–60% with a hygrometer
Frequently Asked Questions
Does a moisture absorber really work?
Yes, in small enclosed areas. CHOICE testing showed products like DampRid can lower humidity levels significantly.
What is the most effective moisture absorber?
Calcium chloride-based products are very effective. Silica gel packets are best for small storage.
What is the difference between a moisture absorber and a dehumidifier?
Moisture absorbers are passive (no power, single-use). Dehumidifiers are active, faster, and can cover whole rooms.
What is the best thing to absorb moisture in the house?
For wardrobes, cupboards, and cars – moisture absorbers. For living rooms and bedrooms – dehumidifiers.
Final Thoughts
So, do moisture absorbers work?
Yes – they’re cheap, easy, and effective for smaller spaces. They help reduce damp smells, lower humidity, and prevent mould from returning after treatment.
But for large or ongoing moisture problems, a dehumidifier is the better choice.
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