Earthenware jars (zeers) are possible breeding places for mosquitoes and they should therefore be turned upside down and thoroughly dried out twice a week.

Sandflies may breed in the constantly damp sand beneath jars and the latter should consequently be moved frequently.

The use of a common mug and the habit of dipping a mug into the jar are both undesirable practices from a health point of view. Where individual drinking utensils are not available men should use their bottles for drawing water.