Reverse Osmosis Deionization (RODI) systems are essential for producing clean, purified water for your window cleaning needs. However, you may notice that the pre-filters in your system can change color to black, orange, or even green over time. While this might be concerning, these color changes are typically due to natural factors like sediment buildup, algae growth, or iron contamination. Let’s dive into what causes these changes and how to prevent them.

Sediment Buildup and Clogged Filters

One of the most common reasons for color changes in pre-filters is sediment buildup. Over time, dirt, debris, and other particles accumulate on the filter surface, causing it to darken. Extended use can also clog sediment or carbon filters, further exacerbating the discoloration.

A key sign that your filter is clogged is a drop in water pressure. When this happens, it’s time to replace the filter/s to maintain optimal system performance and water quality to achieve the spotless results both you and your clients expect.

Algae Growth: The Green Culprit

Algae growth is another reason why your filters might turn green. Algae thrive in environments exposed to sunlight and warmth, making filters particularly vulnerable if your system is placed near a window or in a warm area.

To prevent algae growth, consider relocating your RODI system to a cool, dark place, away from direct sunlight. This simple step can significantly reduce the risk of green discoloration caused by microbial growth.

Iron Buildup: Orange and Black Staining

Iron in your water can cause your filters to take on an orange or even black hue. There are two common types of iron buildup:

• Ferrous Iron: This form of iron is dissolved in water and can cause filters to turn orange or red as it oxidizes.

• Ferric Iron: Already oxidized, ferric iron enters the system as red or orange particles, staining the filter immediately.

In some cases, black staining might occur due to manganese (commonly mistaken as black iron). Both manganese and iron are natural elements often found in well water or water systems with high mineral content.

Carbon Filters: A Natural Black Hue

Carbon filters, be design, have a black hue due to the manufacturing process. While some discoloration is normal, it’s crucial to flush your system after installing new carbon dust. This helps ensure your system operates efficiently while reducing the risk of buildup.

Maintenance Tips to Prolong Filter Life

Regular maintenance and proper care are essential for preventing discoloration and extending the life of your filters. Here are some practical tips:

1. Flush Your System Frequently: Flushing your system regularly helps prevent sediment, iron, and microbial buildup, keeping your filters cleaner for longer.

1. Monitor Water Pressure: A sudden drop in pressure is a clear indication that it’stime to replace your pre-filters.

1. Choose the Right Location: Place your system in a cool, dark area away from windows to discourage algae growth.

1. Test Your Water Source: If you suspect high levels of iron or manganese in your water, consider testing it and installing a pre-treatment system if needed.

By understanding the causes of filter discoloration and adopting a proactive maintenance routine, you can ensure your RODI system delivers the highest quality water while minimizing potential issues.

Keep your filters clean, flush your system often, and remember: prevention is always easier than dealing with buildup later, or worse, on the jobsite!

Still have questions? Please call and speak with one of our knowledgeable and friendly team members at Detroit Sponge by calling 1-800-535-6394. Or we can always be emailed at customerservice@detroitsponge.com.


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