Worried about algae in your pond or waterfall? You’re not alone. You might be surprised to learn that algae isn’t necessarily a bad thing! It is a sign of a healthy ecosystem. However, when it grows excessively, algae can become unsightly and disruptive. In this article, we will guide you towards creating a balanced, thriving environment that naturally keeps algae at bay.
Key Takeaways
· Implement regular maintenance and natural treatments to prevent algae blooms in your pond or waterfall.
· Provide some shade, control nutrient levels and introduce competing plants to mitigate algae growth.
· Understand the causes of algae growth, such as nutrient imbalance or poor circulation to inform how you treat the algae.
· Balance the benefits and negative impacts of algae, ensuring moderate growth for a healthy ecosystem while preventing harmful blooms.
Algae is a broad term that encompasses a variety of organisms. You’re likely dealing with suspended or string algae in your pond or waterfall. Suspended algae consist of single cells that rapidly reproduce and turn your water green. String algae forms long filaments attached to your water feature’s surfaces. In both cases the algae feeds on excess nutrients in your pond or water feature.
This single-celled organism can rapidly reproduce and, if not properly managed, turn your water feature into a green and cloudy mess. Algae is very small, so most common filtration media don’t filter them out of the water. Suspended algae is often referred to as “Pea Soup”.
String algae is filamentous algae typically attached to rocks or other surfaces in your water feature or other pond surfaces. String algae can reproduce very quickly as its spores are very durable. The long slimy tentacles can become unsightly very fast.
· Regular maintenance of your water feature to prevent algae blooms.
· Efficient algae prevention strategies such as limiting sunlight exposure and controlling nutrient levels.
· Encouraging algae competition by introducing plants that consume the same nutrients as algae.
Despite common misconceptions, the presence of algae in your pond is only sometimes a cause for concern. It plays an important role in maintaining a balanced and healthy aquatic ecosystem. Algae regulation is essential for a balanced pond ecosystem, providing numerous benefits that are often overlooked.
Here are some key points to remember about algae in your pond:
· Algae Benefits: Algae serve as a primary food source for many aquatic organisms, contribute to the overall biodiversity of the pond, and aid in nutrient cycling by absorbing excess nutrients.
· Algae Balance: While excessive algae growth can be problematic, a moderate amount is beneficial for the pond’s ecosystem. Not all algae are harmful; some types are essential for maintaining water quality.
· Natural Solutions: Maintaining a healthy algae balance involves nutrient control, adequate aeration, and regular maintenance practices. Implementing natural treatments can keep algae growth under control without harming the overall ecosystem balance.
Understanding these points can go a long way in managing your pond effectively, creating a healthy, thriving aquatic environment.
While algae plays an integral role in a healthy pond ecosystem, it’s important to remember that too much of it can lead to problems, including poor water quality, oxygen depletion, and overall ecosystem imbalance. Excessive algae growth can encourage algae blooms, a sudden proliferation that can cause the water to turn green, reducing its aesthetic appeal, and can also lead to oxygen depletion, which can harm fish and other aquatic life.
Algae management strategies, such as proper pond maintenance, avoiding overstocking of fish, and using adequate filtration, can help maintain a healthy water feature. Introducing beneficial bacteria and using barley are natural methods of algae management that can help keep algae growth in check. Remember, the goal isn’t to eliminate algae entirely, but to manage it effectively within your pond’s natural ecosystem. By understanding and implementing these strategies, you can guarantee a thriving pond environment.
In winter, your pond’s beneficial bacteria, essential to maintaining water quality, may go dormant. As temperatures warm during spring, this can lead to an imbalance in your pond ecosystem, providing an environment for algae to thrive.
Causes of Suspended Algae or “Pea Soup”
Suspended algae blooms are typically caused by:
· Too much sunlight
· Excess nutrients
· Overfeeding fish
· Stormwater runoff
· Too many fish
· Lack of proper filtration
Suspended algae is common in the spring when the weather starts to warm up, but the water temperature remains low. Low water temperatures mean that the plants that would normally feed on the excess nutrients haven’t woken up yet. Low water temperatures also mean fish are not fully active, and you may inadvertently be overfeeding them. The suspended algae is most likely the only organism actively contributing to your pond’s biological ecosystem.
Causes of String Algae
String algae is caused by the same imbalances as suspended algae, plus too much direct sunlight and excessive nutrients.
· Inadequate biological filtration can lead to a decrease in the efficiency of nutrient breakdown, causing an overabundance of materials that promote algae growth.
· Overstocking or overfeeding fish can result in excess waste, a food source for algae, amplifying its growth.
· Poor pond circulation can also contribute to algae proliferation by creating stagnant areas where algae can flourish.
Algae prevention is about addressing these root causes. By ensuring two thirds of the pond surface is shaded, that there is proper biological filtration, balancing fish population and feeding, and promoting good water circulation you can maintain water quality and exert effective algae control.
To effectively combat algae growth in your pond or waterfall, it’s important to explore a range of treatment options, from increasing plant diversity and beneficial bacteria to optimizing dissolved oxygen levels and implementing an automatic dosing system.
Suspended algae blooms will often clear up in a couple weeks once temperatures rise. Warmer water temperatures means beneficial bacteria can colonize rocks and the biological filter. Warmer weather also means the plants will start to draw on the excess nutrients in the water the algae is feeding on, creating competition for the algae’s food source. If the problem does not clear up after plants have started growing and you have dosed the pond with beneficial bacteria there are severla methods to control suspended algae.
Sunlight has a big impact on your water feature. Too much direct sunlight is often a cause of suspended algae blooms. Provide shade to the pond’s surface by adding plants like water lilies or floating plants that will create shade. Consider planting trees for longer term shade, but try to aoivd shading the entire feature. Adding marginal plants will also help reduce algae by competing for nutrients, plants like:
· Canna lillies
· Water iris
· Cockscrew rush
If your pond has some shade and plenty of plants have a look at you fish numbers. A general rule of thumb is 10 gallons of water per inch of fish. For example, if you have a 1500-gallon pond (approximately 10ft x 10ft. x 2ft deep), you should not have more than 150 inches of fish). If you added fish several years ago, how much have they grown?
Another factor to consider is the possibility of outside chemicals or nutrients infiltrating the pond or water feature through runoff. Lawn fertilizer, flooding during heavy rains, or stormwater runoff can all have big impacts on your pond or water garden’s water clarity. If you notice an abrupt change in your water quality, make sure there isn’t a leak or nearby chemical spraying.
If you have taken all the preventative measures and still struggle with suspended algae you can use a number of effective water treatments to help control the growth.
UV Clarifier
UV Clarifiers use a high-output UVC bulb that eliminates any single-celled algae that pass through the system.
External Canister Filter
An external canister filter can usually be retrofitted to existing ponds that have no built in filtration. We always recommend you install a filtration system when building a new pond or waterfall, but we also know lots of people inherit water features built by previous owners or even contractors that didn’t specialize in water features.
The most effective prevention for string algae is reducing excessive nutrients in your water feature. Don’t overfeed your fish, remove uneaten food and don’t overstock your pond. A good rule of thumb is one inch of fish for every ten gallons of water.
Like suspended algae, too much direct sun can lead to algae blooms. Using aquatic plants to help shield the pond’s surface from direct sun is an excellent strategy. Not only do plants like water lilies shade the pond, but they also compete with algae for the nutrients in the water. A good rule of thumb is to aim for two-thirds shade of the water surface. Taller plants like water iris at the margins can also provide shade throughout the day.
Adding plants to the pond or water feature helps keep algae under control by removing the excess nutrients from the water. Plant competition is a natural and effective way to curb algae. By increasing plant diversity, you encourage nutrient absorption, starving the excess algae of their food source.
Introducing beneficial bacteria can help maintain a balanced microbial ecosystem. These helpful bacteria compete with algae for resources, reducing their proliferation while enhancing water clarity.
Optimizing your pond’s oxygen levels can also inhibit algae. Aeration systems or water features like waterfalls can boost oxygen levels, fostering a healthier ecosystem and reducing conditions favorable for algae.
You can remove filamentous algae with your hands. Be quick as they will release spores as you remove them from the pond. Use scissors to speed up the process.
If you have taken the preventative steps and removing by hand isn’t practical, there are several options to treat the water feature for filamentous algae.
Copper Ions
Releasing copper ions into the water effectively starves string algae of nutrients. It is 100% safe to use with plants, fish and people.
The AutoDoser
An automatic dosing system, or AutoDoser, can consistently apply water treatments, maintaining optimum water quality and preventing algae growth. There are a number of treatment solutions that you can use based on water quality. One tip we recomend is to have an AutoDoser set to treat the water feature with beneficial bacteria to help maintain clear water and ensure a healthy population of these bacteria that compete with algae for nutrients.
Through understanding algae and its causes, you’ve gained the tools to restore the beauty of your pond or waterfall.
Remember, algae control isn’t about extermination, it’s about creating a balanced ecosystem. Keep up with proper filtration, regular maintenance, suitable fish stocking, and effective circulation.
Your efforts will reward you with a healthy ecosystem and clear water without the visible appearance of algae.
Claire and Renald’s back deck was so sweltering in summer that they found themselves lingering out front, on a driveway-turned-patio, just to catch a break from the heat. Although cooler, the courtyard lacked purpose. It was missing that special spark—an actual reason to stay outside and savor the moment.
In the first installment of our Sandbox Series, we’re experimenting with different fountain “toppers” using the same AquaBasin 45 reservoir. Our goal? To demonstrate how a single setup can transform in multiple ways—each with its own vibe, sound, and visual impact. These are our most affordable water features.
Building your watergarden dreams.
Serving:
Qualicum Beach
Parksville
Nanoose
Coombs
Errington
Lantzville
Nanaimo
Cedar
Gabriola
Cedar
Ladysmith
Saltair
Chemainus
Crofton
North Cowichan
Duncan
Nanaimo Watergardens & Landscaping respectfully acknowledges that it operates as an uninvited guest of the Snuneymuxw and Snaw-naw-as people on their traditional and unceded territory.
