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If I have a spring running into my pond do I still need aeration? – Ponds & Lakes Q & A

If I have a spring running into my pond do I still need aeration?

If I have a spring running into my pond do I still need aeration?
Scott – Ripon, WI

Natural springs are an excellent source of water to fill and maintain a farm pond or lake. The volume of water and the rate at which it flows into your pond varies depending on the magnitude of the spring. While a higher magnitude spring can provide a great deal of water exchange they do not do much to help boost the oxygen level in your pond.

Great deals of pond owners believe their water body is spring-fed because the pond water is cold in the deeper areas of the pond. Pockets of cold water are more often caused by a lack of adequate water circulation which leads to water stratification in the water body. This allows a top layer of water which is heated and oxygenated by the surrounding atmosphere to stay at the top of the pond while the water at the bottom of the pond stays trapped, cold and devoid of oxygen. A couple great indicators that your pond is spring fed are that the water level tends to stay the same regardless of rainfall or lack thereof in your area, or if your pond has an outlet and is constantly flowing. Since spring water tends to be colder you will notice that spring fed ponds are cooler even when properly aerated but the entire water body will be cool, not just random pockets of water.

Properly aerating a water body requires not only circulation but the addition of oxygen that can be absorbed into the water column. For this reason, a spring fed pond is not a direct substitute for a proper aeration system. Aeration systems are designed to not only move water around your pond but to boost the dissolved oxygen content of the water column. Bottom plate systems like the Airmax Aeration Systems utilize air compressors and membranes to pump oxygen to the bottom of your pond and then break it down in to small enough bubbles that are absorbed into the water column. This process also forces the water above the plate towards the surface of the pond causing a mushrooming effect that circulates the water body. These type of systems can be used year round. Fountains can also be used to aerate water bodies. Since they draw from the surface of the pond, fountains are usually better suited for ponds 6’ deep and shallower while bottom plates systems work well in deeper ponds. Fountains pump water from the pond and spray it into the air in fine droplets that absorb oxygen and then crash back into the pond. With this principle in mind you might be able to guess that a fountain that sprays a thicker or solid stream of water adds less oxygen to the pond than one that has a finer spray pattern. While effective in shallow water bodies, these systems are best used only for summer aeration.

Almost every pond can benefit from aeration as it not only provides oxygen for fish but also promotes faster muck digestion and an overall cleaner pond. If you have an aeration system in your pond but are unsure if it is properly aerated you can take temperature readings in multiple depths and areas of your pond and record any extreme variations which indicate a lack of circulation from your aeration system.

Pond Talk: Pond owners implement natural springs to create interesting water features in their ponds in the form of artesian wells and water leveling features which you can find online. Have you found a unique way to take advantage of your spring fed pond?

Keep your pond healthy all winter long!

How do pine needles affect my water garden? I’ve heard everything from poor water quality to no change at all. – Decorative Water Gardens Q & A

How do pine needles affect my water garden? I’ve heard everything from poor water quality to no change at all.

How do pine needles affect my water garden? I’ve heard everything from poor water quality to no change at all.
Betsy – Hinesburg, VT

Your evergreens may hold on to their color during the winter but they will have no trouble shedding a few pine needles. If your pond is pine tree adjacent you most likely have been dealing with the presence of pine needles in your water. Your pine trees can provide an excellent source of shade and privacy but do the negative effects of loose pine needles put your pond or fish in harms way?

As you already know, an abundance of organic debris in your pond can lead to algae blooms, turbid water and unbalanced water chemistry. Organic matter like grass clippings or leaves from nearby trees will eventually turn into an intimidating layer of muck if left at the bottom of your pond. Unlike leaves pine needles are not a huge contributor of tea colored water however, pine needles are acidic and can lower the pH of your pond water to an unhealthy level if left to accumulate. Because of their size, shape and density pine needles are a bit trickier to catch and clean out of your pond. They can easily fall through netting with larger openings and they tend to clog up pond vacuum hoses. To better protect your pond from fallen pond needles use Pond Nettinghttp://www.thepondguy.com/category/water-gardens-and-features-pond-netting with smaller mesh holes. As pine needles tend to float for a while make sure your Skimmer is active and running to help catch as much debris as possible. Your skimmer may require more frequent cleaning to prevent loss of water flow. Any needles that venture to the bottom of the pond can be rounded up with a Skimmer Net and your Pond Vac or you can don a pair of Aquatic Gloves and scoop up any large deposits that form. While pine needles decompose a bit slower than leaves beneficial bacteria products like Seasonal Defense will help break them down and remove any strays you might have missed.

To be fair to all of the evergreens out there, pine needles are not any more harmful than leaves; they just come with their own unique set of challenges. At the end of the day you treat them just like you would any other form of unwanted excess organic material. Keep your pond clean and it will keep you happy, whether you have pine trees, oak trees or no trees at all!

Pond Talk: What kinds of trees do you have around your pond? What methods have you found to be effective against debris from leaves and needles.

Keep your water garden healthy all winter long!

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