How to make Charcoal Sand Water Purifier School science exhibition model


In this topic, we show a charcoal sand water purifier experiment using materials that are easily available.

The water we use comes from lakes, rivers, and groundwater.

It is always very important to clean this water before it can be used for drinking and other domestic purposes.

The process of filtration includes four steps, coagulation, sedimentation, filtration, and disinfection.

There are many methods of cleaning water, they are boiling water, filters, UV water purifiers.

Carbon filtering is one method that has been gaining popularity in the current times.

They are considered to be the most effective way of filtering.

It uses a carbon bed to remove the impurities using chemical absorption.

Each particle of carbon provides a pore structure, exposing the contaminants to maximum visibility to the filter.

charcoal water filter school exhibition model

Materials Used to make Charcoal Sand Water Purifier

  1. Activated Charcoal
  2. Granular small stone
  3. Big stones
  4. Empty Bottle
  5. Marker
  6. Sand
  7. Cotton

You use the resource/tools page section to find the tips where you can buy these materials used at a reasonable cost.

Detailed Video Show How To Make Charcoal Sand Water Purifier School science exhibition model

Questions and Answers for Charcoal Sand Water Purifier

  1. How does
    sand filters work?

A. Sand water filters are the safest to use because they do not require any chemicals to purify the water. Passing the water through the sand filter will strain out the impurities, thus removing the bacteria and most of the solids.

       2. How does charcoal and sand filter water?

      A. Layers of sand and charcoal are placed in the filter for water purification. The sand purifies water with insoluble particles and charcoal has good adsorption property so that it absorbs the organic and mineral impurities.

Charcoal filter along with sand purifiers work the best because they both remove small and heavy metals impurities from water.

      3. Are charcoal water filters safe to use?

      A. Charcoal water filters do not completely filter the water because it cannot filter the heavy metals and bacteria that it may contain. So, carbon filters are not advised to be used for domestic purposes with water coming from limited resources.


Activated carbon is a highly porous material that allows the pollutants to be absorbed. There are two types of activated carbon used in water filtration, they are, granular carbon and powdered carbon.

Active carbon filters are most effective in removing minerals like chlorine, volatile organic compounds and odour and taste from the impure water.

Sand filters in other place help filter larger impurities and also it improves the water quality.

Sand filtration alone won’t make water pure but it requires further process to remove the disinfectants. Thus, sand filters along with activated carbon work the best way for filtering the water.

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