Update: You can purchase a TDS water quality meter at Lazada. Last week I checked the water quality again in my apartment building. I have done it once in the past, this time wanted to look at bottled water as well. I used a portable TDS, total dissolved solids, water test that I purchased from Amazon in the US. Below is the chart that I used to interpret my … [Read more...] about Testing water quality in Saigon (HCMC), Vietnam