- Day 1: Many microbes live in the water. They are invisible to the naked eye, but they are there! While water travels through the filter, the microbes start living in the top layer of sand.
- Day 15: With the use of the filter, more and more microbes start to live in the sand. The biological layer grows. The microbes are at ease and start looking for food.
- Day 30: After a few weeks, the microbes start to eat each other. Now, every time that you pour water, the microbes in the sand will eat the new microbes in the water, including pathogens.
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