as his wife works five days a week at a supermarket, freelance varnisher yeo is usually in charge of. he shows us how he saves water. by attaching a filter to the tap, consumption can be reduced to around half of the original volume. washing vegetables in a bowl is another way of saving water. >> it's not cheap you know. it's not cheap at all. so i have to save water to save money. and you save the country as well. >> he shows us his water bill. >> he uses around 30 cubic meters a month and the bill is taxed at 30%. if consumption exceeds 40 cubic meters a month, not only does the basic charge rise, the bill is taxed at 45%. he also recycles leftover water from the washing machine to clean the hallway. businesses make efforts to reduce water consumption as well. this office building in the central business district has more than 40 floors. water is needed to wash the car park. and to keep the plants in the building's garden green. all of this water comes from tanks that collect and filter waste water from air conditioning units. the units produce five cubic meters of water every day.