Total Dissolved Solids (TDS) and Aquariums

What is TDS?

TDS, or Total Dissolved Solids, is a measurement of the combined concentration of all the substances that have dissolved in water, including minerals, salts, organic matter, and inorganic matter. Water with high TDS levels may be referred to as “hard water,” but it is important to note that this should not be mistaken for General Hardness (GH), which is a separate measure that quantifies the levels of calcium and magnesium ions in water. While TDS provides an overall understanding of the substances present in the water, it does not give specific information about the types of substances that are contributing to the TDS level. Keeping TDS levels in check is crucial for maintaining a healthy aquatic environment and ensuring the well-being of the aquatic life in the tank.

Why measure TDS?

Measuring TDS is important in maintaining water quality in aquariums. High levels of TDS can lead to stress and health problems in aquatic species, including shrimp. TDS levels can be easily measured using a TDS meter or pen and is helpful in gauging water stability and parameters. Measuring TDS can also be useful to ensure that the water in your tank is close to the desired hardness when making your own remineralized water.

Important Note: TDS is not as important as General Hardness (GH) and Carbonate Hardness (KH) and should not be relied upon alone to gauge water quality. Other parameters such as pH, nitrates, and phosphates should also be monitored to ensure a balanced and healthy aquarium environment.

Measuring TDS in Tap Water

Measuring TDS (Total Dissolved Solids) in an aquarium is important to monitor the quality of the water and ensure the health and well-being of the aquatic life. Here are the steps to measure TDS in an aquarium:

1. Purchase a TDS meter: A TDS meter is a device that measures the amount of dissolved solids in water. It’s a small and portable device that can be purchased from a local aquarium store or online.
2. Calibrate the TDS meter: Before using the TDS meter, make sure to calibrate it according to the manufacturer’s instructions. This is to ensure that the readings are accurate.
3. Obtain a sample of aquarium water: To measure TDS in an aquarium, take a sample of water from the tank and place it in a clean container. Make sure the water sample is representative of the overall water quality in the tank.
4. Turn on the TDS meter: Turn on the TDS meter and immerse the probe into the water sample. Wait for a few seconds for the meter to provide a reading.
5. Read the TDS level: The TDS meter will display a numerical reading, which represents the TDS level in parts per million (ppm).
6. Compare the TDS level to the desired range: Aquarium water should have a TDS level of between 100-500 ppm. If the TDS level is higher than 500 ppm, consider taking steps to lower it. If the TDS level is lower than 100 ppm, consider adding minerals to the water to bring it back to the desired range.
7. Repeat the process regularly: It’s important to measure TDS levels regularly to keep track of any changes and take appropriate actions. It’s recommended to measure TDS levels at least once a month.

By following these steps, you can easily measure TDS levels in an aquarium and ensure the health and well-being of the aquatic life.

Reasons for Increasing TDS

TDS (Total Dissolved Solids) levels in an aquarium can increase for several reasons, including:

1. Tap water: If you use tap water for your aquarium, the TDS level can increase due to the presence of minerals, salts, and other dissolved solids in the water.
2. Fish waste: Fish waste, uneaten food, and other organic matter can increase TDS levels in the water over time.
3. Decaying plants: Dead plant matter can increase TDS levels as it decomposes in the water.
4. Evaporation: When water evaporates from the surface of the tank, the concentration of TDS in the remaining water increases.
5. Adding chemicals: Adding chemicals to the water, such as medications or supplements, can increase TDS levels.
6. Mineral buildup: Over time, minerals in the water can build up and increase TDS levels in the tank.

How to Reduce TDS

Reducing TDS in an aquarium is important to maintain a healthy and stable environment for your aquatic life. Here are some steps to reduce TDS in an aquarium:

1. Regular water changes: Doing regular water changes is the most effective way to lower TDS levels in an aquarium. It is recommended to change at least 25-30% of the water every two weeks.
2. Use a high-quality filtration system: A good filtration system can remove TDS from the water and help maintain a stable environment. Canister filters, hang-on-back filters, and power filters are a few examples of aquarium filters that can be used to lower TDS levels.
3. Dechlorinate tap water: If you use tap water for your aquarium, make sure to dechlorinate it before adding it to the tank. Chlorine can increase TDS levels and harm your aquatic life.
4. Avoid overfeeding: Overfeeding can increase the amount of waste in the tank, leading to a higher TDS level. Make sure to feed your fish only what they can eat within a few minutes.
5. Monitor TDS levels regularly: It’s important to monitor TDS levels regularly to keep track of any changes and take appropriate actions. You can use a TDS meter or a water test kit to measure TDS levels.
6. Use RO/DI water: If you have a high TDS level, you can use Reverse Osmosis/Deionized (RO/DI) water to lower TDS levels in the tank. This water has most of the dissolved minerals and impurities removed, making it ideal for aquariums.

By following these steps, you can maintain a healthy and stable environment for your aquatic life and reduce TDS levels in your aquarium.

Conclusion

In conclusion, Total Dissolved Solids (TDS) is an important parameter to monitor in an aquarium as it provides an overall understanding of the substances present in the water and affects the health and well-being of aquatic species. High TDS levels can cause stress and health problems, and therefore, it is crucial to keep TDS levels within the desired range of 100-500 ppm. Measuring TDS levels can be done easily using a TDS meter and should be done regularly to ensure water stability. TDS levels can increase due to various factors such as tap water, fish waste, decaying plants, evaporation, adding chemicals, and mineral buildup. To reduce TDS levels, regular water changes, a high-quality filtration system, dechlorination of tap water, avoiding overfeeding, and regular monitoring are recommended. In addition to TDS, other parameters such as General Hardness (GH), Carbonate Hardness (KH), pH, nitrates, and phosphates should also be monitored to ensure a balanced and healthy aquarium environment.