The first time I checked my Riyadh tap water with a TDS meter, the reading was 540 ppm.For context, the WHO guideline for acceptable drinking water is 300 ppm. Anything above 500 ppm isconsidered poor quality. My tap was sitting at 540. My kettle had already been telling me this for months —that white crust … Continue reading I tested 5 water filters in Riyadh — here’s what actually removes TDS