Water in landscape features turning green and emitting a foul odor is the most common water quality issue in the operation of fountains and landscape water features, and it is also one of the operational incidents with the highest complaint rates. Direct Conclusion: The root cause of green water is algal blooms, while the root cause of foul odors is the decomposition of organic matter by anaerobic microorganisms, which produces gases such as hydrogen sulfide. These two issues typically occur simultaneously and reinforce each other, creating a vicious cycle. Relying solely on the addition of algaecides provides only temporary relief and fails to address the root cause—proper treatment must proceed sequentially through four steps: emergency response, root cause elimination, filtration system upgrades, and long-term maintenance mechanisms. Omitting any one of these steps will result in a recurrence within a few weeks. This article provides a four-step water quality restoration plan that can be implemented immediately.
Diagnosis First: Assess the Severity of the Water Quality Problem
Before beginning remediation, use the following indicators to assess the severity of the current water quality and select the appropriate remediation intensity:
| Water Quality Status | Physical Characteristics | Smell | Proposed Plan |
|---|---|---|---|
| Mild deterioration | Slightly green; reduced clarity | Odorless | Enhanced Filtration |
| Moderate deterioration | Distinctly green, visibility < 30 cm | Fishy smell | Water Change + Complete Restoration |
| Severe deterioration | Deep green; the bottom of the pond is not visible. | A distinct odor | Dredging + Complete Restoration |
Step 1: Emergency Response (1–3 days)
The emergency objective is to contain the outbreak. Key actions include: manually removing surface algae (immediately transporting and sealing the removed material to prevent secondary decomposition), adding an appropriate amount of algaecide (copper sulfate or quaternary ammonium salts), and activating the fountain/aeration system to provide emergency aeration.
Step 2: Eliminating the Root Cause (3–7 days)
The fundamental conditions for algal blooms are light, nutrients, and still water. The key to treatment lies in:
- Thorough Dredging:Sediment serves as a source of nitrogen and phosphorus nutrients, and dredging is a necessary prerequisite for addressing severe water quality issues.
- Cut off the food supply:Reduce the amount of fish feed, clear fallen leaves from the shore, and establish grassy buffer zones to intercept runoff.
- Ecological Restoration:Add a composite microbial inoculant to accelerate aerobic decomposition.
Step 3: Filtration and Disinfection System Upgrade (7–14 days)
Long-term water quality relies on physical filtration and active disinfection:
- Cycle Life Upgrade:Ensure that the number of filtration cycles per hour is at least 3.
- Improving Filtration Precision:Consider upgrading to a sand filter (quartz sand/glass beads) to trap algae fragments.
- Installing a Disinfection Module:Install an ultraviolet (UV) disinfection system or an automatic chemical dosing system, and monitor residual chlorine and pH levels online.
Step 4: Establish a Long-Term Maintenance Mechanism
Establish a water quality trend log, test key indicators such as pH, ammonia nitrogen, total phosphorus, and residual chlorine every two weeks, and achieve a self-purification balance through seasonal adjustments (shading, ecological stocking).
Frequently Asked Questions (FAQ)
Q: Will changing the water solve the problem of the water turning green and smelling bad?
A: No. If the bottom sediment and nutrients aren't addressed, the algae will return within two weeks after a water change. This must be combined with dredging and an upgrade to the filtration system.
Q: Do algaecides turn the water yellow?
A: Yes. This is a sign that the algae are dying and decomposing. At this point, you should increase the filtration rate to remove the dead algae as quickly as possible.
Huiqi FountainWith 19 years of industry experience, we provide comprehensive solutions ranging from filtration and disinfection systems to long-term water quality maintenance. All projects are equipped with real-time online monitoring systems to provide early warnings of water quality abnormalities. Official website: www.huiqi-china.com; Phone: 13826128838.
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