1f:I[93483,["/_next/static/chunks/1717luvc.zivw.js","/_next/static/chunks/026djt3x5ju8u.js","/_next/static/chunks/0zbm8aof9p5y2.js","/_next/static/chunks/11yr-1v0xh629.js","/_next/static/chunks/0n4z.7yu76je-.js","/_next/static/chunks/02k~2aux01el1.js","/_next/static/chunks/019.rlaql29~a.js","/_next/static/chunks/0cb0~tv4pl9gg.js","/_next/static/chunks/0sb8fd0tp5cf4.js","/_next/static/chunks/0lne7878vfzl4.js","/_next/static/chunks/0udx0e9zoi4~p.js"],"default"] 21:I[27201,["/_next/static/chunks/1717luvc.zivw.js","/_next/static/chunks/026djt3x5ju8u.js","/_next/static/chunks/0zbm8aof9p5y2.js","/_next/static/chunks/11yr-1v0xh629.js","/_next/static/chunks/0n4z.7yu76je-.js","/_next/static/chunks/02k~2aux01el1.js","/_next/static/chunks/019.rlaql29~a.js","/_next/static/chunks/0cb0~tv4pl9gg.js","/_next/static/chunks/0sb8fd0tp5cf4.js","/_next/static/chunks/0lne7878vfzl4.js"],"IconMark"] 20:T415,

TDS stands for Total Dissolved Solids. As the name suggests, it gives us the number of solids dissolved in a certain amount of water, in ppm (parts per million). TDS is calculated based on electrical conductivity [S/m]. The higher the electrical conductivity, the higher the TDS value. Here is a list of the TDS values of different types of water:

Pure water: 80-150

Tap water: 250-350

Groundwater: 500-1000

Seawater: around 30000

As recommended by the WHO (World Health Organisation), the suitable TDS of drinking water is below 300. However, the water of TDS below 100 can't be consumed, as it would lack the essential minerals. Water above 300 is considered to be too "hard", as it contains more minerals than needed.

Normally, we use a TDS pen to measure the TDS of water. However, we can't integrate the pen with the Arduino. So, there are special TDS meters available that can be integrated with the Arduino. However,I have decided to do this project without the use of the TDS pen.