There are a few ways to tell when the nuts are used up. A disintegrated soap nut won’t look like it did originally. It will be thin, light colored and falling apart and will resemble floppy/broken peanut shells. The exact number of loads can vary based on water hardness, temperature and machine type.
Here’s some other ways to tell:
1. Smell the bag when wet.
Saponin has a fruity odor when wet. When you take the bag out of the machine, smell it. If there is a slight fruity smell, the nuts are still good for more loads.
2. Run the bag under a faucet and squeeze.
You’ll see little tiny suds if there is still soap.
3. Feel the nuts when wet. they will be slippery if there is still soap.
Below is a video that was made independently by blogger Amanda Hearn from Eco Friendly Family Blog showing how many loads she got with her Eco Nuts: