What do you need the overflow towers for? How do you use them?

The overflow towers are designed to drain the exceeded water, ensuring a minimum amount of water reservoir.

When someone buy a pot embeds the overflow towers, you must make sure that these have holes. In case these pots have not hole will be necessary to drill them according to the diameter of the pot. Then, please add the expanded clay to the top of the overflow tower and ultimately add the soil. Please note that, in case of small pots the expanded clay is not necessary.