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When you already have a pond, you understand how pleasant it can be to gaze off and watch clean, clear water flashing the sun rays. However, when the water comes out in what resembles green smoothie, frustration can only follow-this is especially when you have paid to have a UV system to resolve it. You turn the UV on and wait a couple days… The water is still green. Why?
It is a fact, the pond UV light itself is not a magic wand and though you may have done as That Pond Guy has advised, there are a number of reasons that the green water may still be lingering. We will dissect the most usual suspects and what you can do about them.
1. Your UV Bulb Isn’t as “New” as You Think
The light is ON but the bulb may not be emitting the appropriate wavelength to be able to kill algae. Average UV bulb life is somewhere between 9 and 12 months but full-time use can influence their performance. They may still glow but with poor germicidal output. So, replace your bulb with a new one as it may be out of its peak performance – it can be the easiest solution.
2. Water Flow Rate Is Off
When a stream of water proceeds through the UV unit too fast, the algae are not given enough time to neutralize. Conversely, when the flow is too slow, it can allow debris to settle within the unit and decrease efficiency. Compare the flow rate of your pump with specifications of your UV system. To eliminate a case of green water many of the pond owners simply adjust the pump or introduce a bypass to regulate the speed of flow.
3. The Quartz Sleeve Is Dirty or Damaged
The bulb is enclosed in a protective sleeve of quartz housed inside the UV system. It may accumulate algae film/ calcium deposits/ other types of dirt over time. This film prevents UV light to reach in the water effectively. It can be restored to its functional efficiency by a speedy cleaning with a gentle but not-scratchy cloth and vinegar. Check the sleeve and replace it if cracked because any water leakage may destroy the bulb and shorten its lifetime.
4. Algae Problem Is Larger Than the UV Alone
UV systems cost more money when used alone. When you have nutrients in the water in the excess due to fish waste, uneaten food, or decomposition of plant material, the algae will reproduce faster than the UV system can handle.
You might have to:
- Reduce feeding
- Introduce good bacteria
- Cover the pond with shrubs such as water lilies
- Vacuum the bottom sludge
Bottom Line
UV bulb protects the pond water from getting green and murky, but it’s not a stand-alone solution. To keep water clean, you also need to consider balanced feeding, good filtration, and routine maintenance. A little troubleshooting can help figure out why your pond stays green even with the UV light ON.
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