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Clay pot style evaporative coolers can work but do have their own difficulties. One of the main ones is that the inner clay pot is porous allowing water to enter the storage area. There have been different approaches to overcoming this issue, from the very simple lining with plastic bags to more permanent solutions such as having a glazed inner pot.

The main thing is to have a non-porous inner pot so it doesn't necessarily need to be made from clay.

Other considerations would be to improve the air flow over the storage pot which suggests a shaded outdoor location and the tests in Sudan also suggested that placing in the pot onto a metal support to allow air to pass underneath would also benefit in the cooling process.

However, if the clay pot design does is not suitable evaporative coolers can be made with different materials and can be made larger. There is some information on the subject at... https://practicalaction.org/crop-storage-and-preservation-answers