Clay filters are being used to naturally cool water without electricity. Unlike conventional water filters, clay filters do not purify water but are designed for storage and cooling. The structure includes a stand, a cylindrical or round vessel, and a tap for collecting water. A lid prevents dust from entering. Water cools gradually through evaporation via tiny pores in the clay.
Clay filters come in various sizes, from 6 liters to 10 liters, allowing families to choose based on their needs. Demand increases during hot seasons, according to Tarikul Islam, owner of the online page 'Banglar Mritshilpo'. Both cylindrical and round clay filters are available.
Shamsun Nahar Nahid, head of the Food and Nutrition Department at Birdem General Hospital, notes that plastic containers are not always safe and can contaminate water if not food-grade. Clay vessels are safer and help maintain water's natural properties, provided they are well-fired and made from quality clay. Designs vary, featuring intricate patterns, floral decorations, and modern minimalist styles, with prices ranging from 900 to 2000 Taka.
Before use, new filters must be thoroughly cleaned. They should be washed several times with clean water before first use and left filled with water for a couple of days. Regular cleaning with liquid cleaner at least once a week is recommended. Monthly cleaning with a soft cloth followed by drying in the sun is advised. Water should not be left in the filter for too long; it should be changed at least every two days.
