I live in Dhaka, Bangladesh and recently I seem to smell a very "different" smell when drinking the water at home. The water arrives in a utility pipelines from the utility company and is then boiled at home and passed through a water filter machine. Something like this: https://www.pickaboo.com/electronics-appliances/home-appliance/water-filter/unilever-pureit-classic-water-purifier-23l.html
This problem happened about half a year ago and then suddenly stopped. I called the utility company then and did so now but they keep on saying they will arrive and test it but never do.
Is there any cheap devices or other homemade technique to find out: 1) What is causing the smell? and 2) Whether sewage is present and 3) Whatever is causing the problem how do I clean the water thoroughly of it?
There seems to be a water testing laborartory according to Google search but I don't know how I can send a sample to them and whether they would accept it from the public: https://www.dphe.gov.bd/index.php?option=com_content&view=article&id=127&Itemid=135