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I have a small floating weed in my pond. I think it is duckweed, how do I know and how do I treat it? | Pond & Lakes Q&A

I have a small floating weed in my pond. I think it is duckweed, how do I know and how do I treat it?

I have a small floating weed in my pond. I think it is duckweed, how do I know and how do I treat it?
Jason – Raleigh, NC

Duckweed can be a real nuisance if not identified and treated correctly. As it is a prolific grower it can quickly make your pond or lake look more like a golf course in a relatively short period of time. Duckweed is a small floating weed with a single root hair extending from the bottom of each individual leaf. Each green leaflet is about 1/8” of an inch in size and you should be able to fit about 5 to 10 on the tip of your finger. Duckweed can sometimes be confused with watermeal which is also a small green floating weed. Watermeal differs from duckweed in that it is much smaller and has a grainy or almost sandy feel to it if you hold it in your hands.

You can treat duckweed with two different methods. The first method is by spraying contact herbicide like Ultra PondWeed Defense® & Treatment Booster™ PLUS directly onto the floating masses with a pond sprayer. This method typically yields fast results but tends to be a quick fix that ends up resulting in new growth reforming over just a few weeks. If you need to whip your pond into shape for a planned day or two event, then spraying your pond with a contact herbicide may be an appropriate treatment for you.

For longer lasting control of duckweed you can treat the pond with Sonar™ A.S. aquatic herbicide. This product works by inhibiting the plants ability to produce carotene and as a result chlorophyll is degraded by the sunlight and the weed dies. There are however a few things you will need to check before adding it to your pond to ensure a successful treatment. Most importantly, Sonar™ A.S has a 30 day irrigation restriction meaning that if you water your plants or grass with your pond water you will not be able to do so for at least 30 days. Secondly, Sonar™ A.S needs to maintain a high concentration in the pond for up to 90 days. If your pond is prone to overflow or has an inlet/outlet chances are that the Sonar™ A.S will rinse out of your pond to quickly making the treatment less effective. A good way to visually check your water loss is to color the water body with pond dye. Dye will typically remain in your pond for 2-4 weeks in normal conditions. If your pond looses color sooner then it is a great indicator that too much water is exiting the pond. As Sonar™ A.S is degraded by sunlight it is important that you dye your pond while you are chemically treating the water body. When applying Sonar™ A.S use a pressurized tank sprayer and submerge the spray nozzle to apply the herbicide beneath the surface of the pond where it is safe from evaporation and sun exposure.

The best time to use Sonar™ A.S is early in the spring a couple of weeks before you normally see duckweed forming in your pond. This will give the herbicide a chance to establish itself in the pond and discourage plant growth before it gets out of control.

Pond Talk: Have you experienced Duckweed in your pond?

I’ve always been told to use lava rock in my waterfall filter, is this the best media to use? | Decorative Ponds & Watergardens Q&A

I’ve always been told to use lava rock in my waterfall filter, is this the best media to use?

I’ve always been told to use lava rock in my waterfall filter, is this the best media to use?
Tara – Bon Temps, LA

Lava rock was a common form of biological filtration media in waterfall boxes as its porous surface provides room for bacteria to reside. While it was popular years ago, pond supply companies have since produced better forms of secondary biological filtration media that are friendlier for both you and the pond itself.

Using lava rock as a source of filtration media has a list of distinctive drawbacks. The first of which is that it can prove to be extremely heavy and cumbersome. It is not exactly easy to lift a bag of rocks out of your pond, especially when it is full of water and debris.
While lava rock is porous and can initially provide a reasonable amount of additional surface area, the coarseness and small opening sizes tend to hold on to passing-by debris, blocking the waterways which greatly diminishes the stone’s performance. Once lava rock is loaded with debris you will have to remove it form your filter box and replace it with new media as it is near impossible to remove the debris from within each rock. For some pond owners this means they would need to replace their lava rock media multiple times each season for optimal performance. Furthermore lava rock tends to be brittle and can leave behind additional dust and debris in your pond.

Biological filtration media like BioBalls™ filter media provides all of the surface area that your beneficial bacteria desire but implement it into a light-weight cost-effective design. One of the best qualities of secondary filtration media like the BioBalls™ is that you only have to buy them once. The Pond Guy® BioBalls™ do not degrade over time and can simply be rinsed out at the end of the season and reused the next. BioBalls™ can placed into a mesh media bag and can be placed right into your waterfall filter box.

Pond Talk: Have you used lava rock as filter media in the past and switched to bio balls or another form of media? Did you notice a difference in filtration performance?

The Pond Guy® BioBalls™

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