Describe the process of homemade sand filter

Air bubbles are blown into the sand bed to make it swirl around. Filtered water then flows through the filter bed in the opposite direction. The polluted matter is released and flows away along with the rinse water. The filtration process can then resume.

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sooo homemade sand filter used to remove fine impurities.

Explanation:

Filtered water then flows through the filter bed in the opposite direction. The polluted matter is released and flows away along with the rinse water. The filtration process can then resume.

meaning the water goes through the filter bed in the opposite side then then the polluted matter releases and flows with the rinsing water.

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