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My pond was a mess, so I drained and refilled it. Now I have algae. What do I do? | Decorative Ponds & Water Gardens Q & A

Q: My pond was a mess, so I drained and refilled it. Now I have algae. What do I do?

Q: My pond was a mess, so I drained and refilled it. Now I have algae. What do I do?

Beth – Benton, AR

A:  Sometimes it’s just easier to start from scratch – particularly if you have a disaster in your pond.

A complete water change rids your water feature of excess organic waste, clears up murky water (briefly, as you’ve discovered) and gives you a chance to start over with a clean slate. Those are some worthy benefits!

The urge to purge, however, has its drawbacks. If you’ve completely drained the water from your pond and scrubbed everything clean, you’ve also stripped a lot of the beneficial bacteria that was working to help clean the pond in the first place! The algae that’s growing now is most likely due to fish waste and a lack of mature filtration.

To return your pond to its crystal-clear state, here’s what we recommend.

  1. Decide how bad it really is: Believe it or not, some algae in your pond is natural and beneficial as it helps filter the water. Make sure your expectations are in line with the reality of having a pond, and then let the pond take its natural course with a little help from you. But be patient! The Nitrogen Cycle will eventually help clear things up naturally – but it takes time. If your water quality begins to suffer a few weeks in, think about doing a partial water change and/or following these additional suggestions.
  2. Treat if necessary: If the algae is becoming excessive, treat the algae growth with an algaecide in the morning or evening when water temperatures are cooler. In addition, make sure you have adequate aeration to ensure oxygen levels stay high for your finned friends.
  3. Seed Your Filter Media: To kick-start the regrowth and reproduction of beneficial bacteria in your pond, add some DefensePAC® to your pond and filter. The package contains Nature’s Defense®, which instantly begins breaking down dead organics in the pond; Clarity Defense®, which helps clear debris suspended in the water column; and Muck Defense®, which attacks buildup on the liner, rocks and gravel.
  4. Condition the water: When you refill your pond with water, be sure to use Stress Reducer PLUS to condition the water and reduce fish stress. It helps your fish form a beneficial slime coat that’s lost from stress or handling, and it also makes tap water safe by working to remove chlorine, chloramines and heavy metals.
  5. Learn from the situation: Instead of letting your pond fall into its “mess” state again, figure out why it wound up in that situation in the first place. Are there too many fish living in your pond? Is your filter too small for your pond’s volume and fish load? Do you need more plants growing in and filtering the water? Does your pond receive too much sun or rain runoff? Dig down to the root cause of the problem and correct it!

In the future, if you find your pond’s water quality waning, consider doing a partial water change instead of a complete water change. A little fresh water will go far to clear things up without having to start completely over!

Pond Talk: Have you ever had to restart your pond from scratch?

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There is an Oil Slick Film Covering My Pond. How Do I Get Rid of It? – Pond & Lake Q & A

Algae, Duckweed, Watermeal & Pollen Identification

Q: There is a brown rust-like film/oil slick covering my pond. Do you have an idea what this might be and how to get rid of it? – Several Customers

A: There are several things this could be: Algae, duckweed, watermeal or pollen.

Determining if Algae is a Problem: Filamentous Algae will float around the pond’s edges in mats while Planktonic Algae will make the whole body of water to look like a “pea soup” green color. If this is the case, using Algae Defense® Algaecide will provide quick control. Follow up with PondClear™ for long-term clear water.

Determining if Duckweed or Watermeal is the Problem: Duckweed and Watermeal are very rapid growers and will cover an entire pond if they get out of control. Looking to the pictures to the left, you can see that Duckweed is a small plant the size of a pencil eraser, while Watermeal is about the size of the tip of a pencil. If you determine that you have Duckweed or Watermeal. Your only long-term option is Sonar™ A.S. for Duckweed and Clipper™ for Watermeal. If you only require short-term control (3-4 weeks) for an event or party Ultra PondWeed Defense®” may be used.

Determining if Pollen is the Problem: What may look like a greenish, brownish algae, may actually be pollen. Pollen may even cause an oil-slick or film on the surface of the pond. There is no magic product that will give you a quick fix. Many times a heavy rain will settle it to the bottom. In many cases if your pond receives good circulation from an aerator or fountain you will not see pollen becoming much of a problem.