Can We Use RO Water for Plants?

Reverse osmosis (RO) systems are a popular way to purify water. Although they can remove impurities from water, not all water sources are created equal. Some RO systems can remove essential nutrients from the water, which are necessary for plant growth. In this article, we’ll explore the question, can we use RO water for plants?

What is RO Water?

Reverse osmosis is a water purification process that uses a semipermeable membrane to remove impurities from the water. An RO system forces water through the membrane, removing contaminants such as chlorine, fluoride, dissolved salts, and other mineral ions. The result is purified water with a pH level of around 7.0.

Does RO Water Lack Essential Nutrients?

One downside of RO systems is that they remove essential nutrients, such as calcium, magnesium, and potassium, which are necessary for plant growth. These minerals may be present in tap water but can be removed by an RO system. Additionally, RO systems may also remove micronutrients required for plant growth, such as iron, copper, and zinc, which are present in small quantities in tap water.

Using RO Water for Plants

While RO water may lack essential nutrients, it can be a viable option for certain plants. For example, some plants, like orchids and carnivorous plants, can thrive in low-mineral water. If you decide to use RO water for your plants, there are a few things to keep in mind:

RO water is typically acidic, with a pH level of around 5.5 to 6.5. Test the water beforehand and adjust the pH if necessary.

RO water lacks minerals, so you will need to fertilize your plants regularly. Use a fertilizer specifically formulated for plants grown in low-mineral water.

RO water may cause salt buildup in the soil over time. To avoid this, leach the soil with regular tap water periodically.

Alternatives to RO Water

If you’re concerned about the lack of essential nutrients in RO water, there are alternatives you can consider. One option is to use tap water, which may contain the necessary minerals. However, tap water may also contain impurities like chlorine or fluoride, which can harm your plants. Another option is to use a blend of RO and tap water, which can provide the necessary minerals while reducing impurities.

Conclusion

While using RO water for plants is possible, it requires careful consideration and precautions. Depending on the plant species, it may be better to use tap water or a blend of RO and tap water. If you do choose to use RO water, be sure to monitor your plants’ growth and adjust your fertilizer regimen accordingly.