In Germany, we are proud of our tap water – it is one of the most strictly controlled food products. However, what is healthy for humans can be fatal for invertebrates in an aquarium. Shrimp, crayfish, and snails react many times more sensitively to ingredients that are not included in our drinking water regulations at all, or only with high limit values.
The invisible dangers: Why tap water fluctuates
Many aquarists feel safe because their water "has always been good." But tap water is not a static product. The values can change massively over the course of the year.
1. Fluctuations due to waterworks
Depending on groundwater levels or maintenance work, waterworks mix different sources (e.g., surface water with groundwater). This leads to fluctuating hardness levels and pH values. For sensitive high-bred shrimp, a sudden increase in carbonate hardness can trigger stress and molting problems.
2. The nitrate trap from agriculture
Especially in rural regions, high amounts of nitrate enter the groundwater due to fertilization of fields. While the limit value for humans is 50 mg/l, this value is far too high for a closed system like an aquarium. High nitrate levels inhibit the growth of young shrimp and can negatively affect molting.
3. Chlorine and copper: The classics
- Chlorine: Is often added for disinfection after heavy rainfall or during pipe cleaning. It directly attacks the gills of invertebrates.
- Copper: Many households still have copper pipes installed. Since invertebrates do not have hemoglobin, but hemocyanin (copper-based) in their blood, dissolved copper acts as a neurotoxin even in the lowest concentrations.
How does a water conditioner work?
A good water conditioner is much more than just chemistry. It acts as a shield. Modern preparations work with so-called chelators. These "grab" free metal ions (like copper or lead) and bind them so tightly that they are no longer bioavailable – and thus harmless – to the animals. In addition, aggressive chlorine and chloramines are immediately neutralized.
Our expert tip: GlasGarten Liquid Protect+
GlasGarten Liquid Protect+
Specifically tailored to the needs of modern aquaristics:
- Immediate binding: Neutralizes chlorine and heavy metals in seconds, before they can cause damage.
- Mucous membrane protection: Contains ingredients that form a fine protective film over the animals – especially important after a water change.
- Bio-activation: Supports the beneficial bacterial flora in the tank, which ensures stability especially with fluctuating water values from the tap.
- Food-safe & secure: Leaves no residues that could harm invertebrates.
Don't rely solely on the conditioner. Always let the water run for 1–2 minutes before filling the bucket to get rid of stagnant water from the pipes (and thus the highest copper concentration). Then add the appropriate dose of Liquid Protect+ directly to the change water before it enters the aquarium.
Conclusion
Tap water is a natural product and subject to constant changes. Anyone who loves their shrimp and crayfish takes no risks. A high-quality water conditioner is the cheapest and most effective insurance against sudden death after a water change.
