The container demo method
2 identical containers are used with fast growing plants.
These containers are filled at or nearby the clients site, so he can convince himself of the value and honesty of the test.

In container 1, the normal plant conditions are simulated, normal ground.
In container 2, TerraCottem is used.
2 alternatives:
Both containers get the same quantity of water.
The salesperson can call or pass by on regular basis to check the conditions of the different plants. In this way, he can react quickly if something goes wrong for one reason or another. (e.g. containers are not treated, moved etc)
An alternative way of doing this is by setting-up the test in e.g. the botanical garden, controlled by a scientist and director of this garden. On regular periods, once a day, snap shots are taken of the plants. A clear sign in front of each container should explain which container is which case, the normal or TerraCottem one.
Because no new water is given, the container without TerraCottem will die or perform worse than the TerraCottem container.