The picture to the left shows the capillary mat of the APS-6 unit that was holding the Winter Melon seedlings. This is only have 2 weeks of use.
This defintely cuts down the usefulness of the APS units. They are very convenient to use. I only have to water once every few days. The APS-24 units are great for germinating seeds. But Algae just grows too quickly. I don't know if this is artifact of how the APS unit is put together or if all self-watering containers have the same problem.