Why dissolved substances in water are more important than you think
Water is supposed to be pure, healthy, and minerally balanced. But what's actually in it?
Many people rely on appearance and taste – but one of the most important values for assessing water quality is invisible : the so-called TDS value .
But what does TDS (Total Dissolved Solids) actually mean?
And when does it become critical?
What is TDS anyway?
TDS stands for “ Total Dissolved Solids ”, i.e. the sum of all dissolved substances in the water – regardless of whether they are of natural or artificial origin.
This includes:
- Minerals such as calcium, magnesium, potassium, sodium
- Salts such as chlorides and sulfates
- Traces of metals such as iron, copper or even lead
- Organic residues
- Chemicals from pipes, fertilizers or industrial sources
The TDS value is measured in ppm (parts per million) or mg/l .
Why is the TDS value important?
TDS is not a direct indicator of pollutants , but rather an early warning system . It indicates the total concentration of dissolved substances in the water.
A value that is too high or too low may indicate that:
- Minerals are missing – the water is “dead” or aggressive towards pipes and organisms
- Contamination – e.g., by heavy metals, nitrate or industrial chemicals
A team from the University of California found:
TDS levels above 600 ppm often cause taste complaints , especially in areas with high sodium or sulfate levels .
The best rated water was one with a TDS value of 50–150 ppm – fresh in taste, balanced in mineralization .
What is the TDS level in tap water?
The TDS value varies greatly depending on the region:
- In “soft water regions”: 70–150 ppm
- In hard water areas: 300–450 ppm
- For RO (reverse osmosis) systems: below 50 ppm – sounds good, but is often mineral-free
At Sydros, we recommend a TDS level of 80–200 ppm because this is where the balance between purity and minerals is best. Our filter systems retain important minerals while selectively removing contaminants.
When does TDS become a problem?
-
Very low TDS values (<50 ppm) :
➤ The water is “empty” – mineral-free, often tasteless
➤ Can have a corrosive effect (especially on old pipes) -
Very high TDS values (>500 ppm) :
➤ Indication of excessive contamination – e.g., from heavy metals or industrial residues
TDS is therefore not a final judgment , but rather an indicator . Targeted analysis for critical substances such as PFAS , lead , or chlorine is always crucial.
What makes Sydros different?
Normal table filters barely change the TDS – or remove too much.
Our multi-stage filter systems rely on ultrafiltration, activated carbon, ion exchange and adsorber technologies :
- Specifically filter pollutants such as PFAS, heavy metals, pesticides
- Retain vital minerals
- Bring the TDS value into the ideal range – between 80–200 ppm
Conclusion: TDS is more than just a number
The TDS value gives you insight into the true quality of your water .
It is not a substitute for a pollutant analysis – but a valuable indicator of purity, taste and mineral content .
Those who truly understand water measure it.
Learn more at
🔗 www.sydros.de – Your source for certified clean water
