The short answer is Yes, the sachets can be used again if they have not absorbed any water.

Now here’s the longer answer: 
If the sachets are left out of the grip seal bag the contents will start to absorb moisture from the air. This can be in the form of the atmosphere or the moist air within the camera housing. This is of coarse an advantage as it will reduce/stop condensation forming on the inside of the camera housing (fogging). If this happens the contents will start to solidify in to a firm gel. This does NOT mean they cannot be used again. It just means the reaction time is very slightly reduced.

I recently spent a week diving in Sharm El Sheikh, in total 8 dives. I used the same sachet on every dive, despite opening the housing at the end of each day to copy the images from my memory card.

2. How do you store the absorbent sachets?

The sachets are supplied in a watertight container or grip seal bag, as long as they are kept in this container you can store them anywhere.

3. How long can you keep the sachets for?

As long as the sachets are kept dry, they do not have a shelf life and should last for years.

4. How many sachets can I use?

As the sachets can be reused if your case does not leak, you can use as many sachets as you like.
Each standard size sachet has been designed to hold approximately 40ml of water. To be on the safe side we suggest you use 2 or more sachets. You can also use different size sachets, for instance a standard sachet under the camera and Mini’s at either size.

BETTER TO BE SAFE THAN SORRY!!

5. Are the contents of Leak Insure Sachets harmful?

The absorbents in our sachets are non-toxic and will not harm you or the environment. As with everything there are some precautions you need to take. DO NOT swallow, as the absorbents will swell when they get wet. DO NOT discard, as they are slippery when wet.

All the products used in the manufacturing of our sachets a non toxic and bio degradable.

7. What happens if the sachet splits?

Our sachets are designed to hold a set amount of water without splitting. The problem is, if the leak is more than a minor one then this may not be enough.

With this in mind we designed the sachets so they would split if the amount of water that leaked in to the housing were more than the capacity of the sachet. This means the absorbent gel can continue to absorb water. We feel it is better to have a camera full of gel than water.

Below is a photograph of an iphone in some of the gel to show how much the water is absorbed. The iphone continued to work and was dry when it was pulled out. The gel can just be brushed off.