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Here you can find a series of questions asked by the website users. Please feel free to add any other questions you may have, in the right section. You don't need to be logged in to ask a question.

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What material do I need for this experiment?
To conduct the experiment about filtration, you will use:

• 2 liters of “dirty” natural water (or you can add 1 cup of dirt or mud to 2 liters of water)
• 3 liters of clean water.
• 1 two liter plastic soft drink bottle with its cap (or cork that fits tightly into the neck).
• 2 two liter plastic soft drink bottles, one with its bottom cut off to use as a funnel and one with the top cut off to use for sedimentation.
• 1 large beaker (with a volume of 500 ml, or 2 cups) or measuring bowl that will hold the inverted two liter bottle or you can use another two liter plastic soft drink bottle with its top cut off so the other bottle will fit inside of it.
• 2 tablespoons of alum
• 1½ cups fine sand
• 1½ cups coarse sand
• 1 cup small pebbles
• 1 coffee filter
• 1 rubber band
• 1 large spoon
• A clock with a second hand or a stopwatch

The activities of the Global Water Experiment are designed to be undertaken with equipment and materials commonly available in a school laboratory. However if preferred, a kit especially designed for carrying out the activities in the Global Water Experiment can be purchased from the Radmaste Centre at the University of Witwatersrand in South Africa: http://www.radmaste.org.za/. Adapted experimental protocols have been developed for these kits to ensure consistency with the Global Water experiment.

The kit is supplied as a school resource with the common equipment and materials to perform the experiments and ten individual sets of equipment for student use (which can also be ordered individually). The price of the kit is about $US165 and does not include postage and packaging. The order form and the up-to-date prices can be found at:
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