Simple Truth Purified Water Test Results Two special pH modes (for distilled water and distilled water mixed with ammonia) are provided. Our technicians use a Wide Range pH Test Kit to confirm this calibration. Calibrate your meter with the solution, and test your distilled water. As you can see in the picture, the watercolor during the test was red. The scale ranges between 0 and 14. If the water appears tasteless or bland like you have in distilled water, the TDS levels are low. Source of TDS is natural and manmade. The pH of water determines the solubility (amount that can be dissolved in the water) and biological availability (amount that can be utilized by aquatic life) of chemical constituents such as nutrients (phosphorus, nitrogen, and carbon) and heavy metals (lead, copper, cadmium, etc. TL;DR (Too Long; Didn't Read) The pH of distilled water immediately after distillation is 7, but within hours after distillation, it has absorbed carbon dioxide from the atmosphere and become acidic with a pH of 5.8. They are much more reliable and accurate than pH strips, and they are able to measure higher pH levels. I got some water, for the same reason, and it tested 9.0. It is not exactly 7. pH. The ocean has a TDS of 30,000 ppm. Why is TDS important to water quality? When we tested Simple Truth purified water, the TDS balance in the water was 22ppm. The pH of distilled water is actually slightly acidic. These special modes offer general slope compensation and non-linearity solution temperature compensation suitable for the electric power and petrochemical industries. TDS – A Brief Recap. TDS comprises of organic and inorganic salts. These meters must be calibrated periodically to ensure accuracy. TDS is simply a measure of the substances dissolved in water. That means Simple Truth is micro-filtered and distilled water. It means Simple Truth purified water is acidic. I would suggest buying a small packet of PH solution of 7.0, they are cheap. This is because as soon as distilled water comes into contact with the air, carbon dioxide gas dissolves in it and creates a dilute solution of carbonic acid. The value could only be exact if it were exact by definition, but it is not defined that way. It should be 7.0.. but check it anyway.. Importance of pH. Water with TDS up to 500 mg/litre is acceptable for drinking. Pure distilled water should be neutral with a pH of 7, but because it absorbs carbon dioxide from the atmosphere, it's actually slightly acidic with a pH of 5.8. Distilled water has a TDS of 0.5 ppm or less. And yes, it was "distilled" water … tl;dr - The pH of pure water at 20°C is definitely in the range 6.96 to 7.04. TDS is not a direct measurement of harmful substances or pollutants. pH = hydrogen ion concentration. ). A Wide Range pH Test Kit utilizes reagent drops to measure pH levels of low TDS, highly purified water. The meter can recognize up to 13 types of pH standard buffer solutions. TDS meters are easy to use and provide an accurate TDS reading for many water quality applications. The pH balance in the water was 5.5.