Can I Use RO Waste Water in a Planted Aquarium?

Reverse Osmosis (RO) water is widely used in aquariums as it is free from impurities, but what about the waste water that is left behind after the RO process? Can it be used in a planted aquarium? Let's explore.

The Dangers of Using RO Waste Water in a Planted Aquarium

Firstly, RO waste water may contain high levels of Total Dissolved Solids (TDS) which can be harmful to plants and aquatic life. The TDS may comprise of minerals and chemicals that can cause imbalances in the water chemistry, leading to issues such as stunted plant growth, algae growth or even death of aquatic life.

In addition, the RO waste water may also have a high pH level due to the removal of carbon dioxide during the RO process. A high pH level can be detrimental to aquatic plants as it affects their nutrient absorption abilities, causing them to become weak and stunted.

Another issue with using RO waste water is the lack of essential trace elements that are present in regular tap water. These trace elements are necessary for the healthy growth of plants and aquatic life, and the absence of it may lead to nutrient deficiencies.

Ways to Use RO Waste Water Safely in a Planted Aquarium

If you still want to use RO waste water in your planted aquarium, there are some ways to do it safely. Firstly, you can use the RO waste water for non-aquatic plants such as house plants or in your garden. Another option is to use the RO waste water as a top-up water during water changes to dilute the high TDS levels in the aquarium.

If you decide to use the RO waste water directly in your planted aquarium, it is crucial to test the water chemistry regularly and adjust as necessary. Adding in trace elements and adjusting the pH level can help provide a suitable environment for your plants and aquatic life to thrive in.

The Benefits of Using Tap Water in a Planted Aquarium

Although RO water is popular because of its purity, tap water may actually be better for a planted aquarium. Tap water contains essential trace elements such as calcium and magnesium, and also has a pH level that is close to neutral which is ideal for most aquatic plants.

However, tap water may contain chlorine or chloramines which are harmful to aquatic life, so it is crucial to treat the water with a suitable conditioner before using it in your aquarium.

Conclusion

While RO water is commonly used in aquariums, the waste water produced by the RO process should be used with caution in a planted aquarium due to its high TDS and pH levels. If you still want to use RO waste water, it is important to test the water regularly and adjust the chemistry as necessary. Overall, tap water may be a better choice for a planted aquarium, but it is essential to treat it with a suitable conditioner before using it.