There’s only one thing worse than green water—and that’s brown water. In some ponds or water features, the end of summer or beginning of fall brings with it this discolored water. It’s caused by one of two reasons:
- Debris Tea: When leaves or pine needles fall into your pond, the tannins in them create a type of all-natural debris tea, which turns the clean and clear water in your backyard feature a shade of brown. This is the most common cause of tea-colored water.
- Sediment Stew: If you have a lot of floating particulates or sediment in your pond, playful fish, wind or some other action can sometimes disrupt it, mixing it into your water column via your pump or aeration system.
How to Determine the Cause
To determine what’s causing the brown water, grab a glass jar from your kitchen, dunk it in your pond and fill it with the water. Let it sit for 24 hours and take a close look at the results. Is the water still tea-colored? Then you have tannin-colored debris tea. Do you see sediment settled at the bottom of the glass? Then you have some sediment stew.
How to Treat the Problem
Once you pinpoint what’s causing the brown water, here’s how to treat the problem.
- Clean It Up: Because both causes start with an abundance of organics in the water, your first course of action is to clean the bottom of your pond to remove any muck, leaves and remaining debris with a pond vacuum or skimmer net.
- Water Change: Next, do a partial (10 to 25 percent) water change, which will freshen things up and clear the water. Don’t forget to add a water conditioner to treat the water for your finned pals.
- Add Beneficial Bacteria: If you have sediment stew, add some Nature’s Defense® (if water temps are above 50°F) or Seasonal Defense® (if water temps are below 50°F). The beneficial bacteria will digest any accumulated organic debris and eliminate the brown water.
- Use Activated Carbon: If you have debris tea, toss a media bag filled with Pond Logic® Activated Carbon into your pond. The carbon will absorb the tannins, leaving behind clear water.
To prevent the discoloration from happening again, keep the organics out of the pond. Clean up the muck regularly with a skimmer net or vacuum, and when the leaves or pine needles start falling, cover the water with pond netting, like the The Pond Guy® PondShelter™ Net Kit or The Pond Guy® Premium Pond Netting.