I’ve promoted the free drinking water dispensers at airports before, but several people had a valid question. How much can we trust that they maintain the filters? So, I brought along a TDS Water Meter to measure dissolved solids in the water.

The first TDS reading is tap water at Phuket Airport. At 92ppm that is actually safe to drink or at least brush your teeth with.

* Obviously my meter doesn’t test for everything. For example, it doesn’t detect poisons like arsenic and so only use it as a guide.

At Phuket Airport, they have these drinking fountains. The TDS reading here is 66ppm which is still within accepted limits for drinking water.

Phuket Airport also has these hot and cold water dispensers. The TDS reading here was zero which meant no dissolved solids. My

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