Q: The string algae seems to grow in just a few hours in my stream. What can I do?
Edith – Marion, IN
A: String algae. It seems to just grow and grow, leaving a tangled mess of green slimy stuff in your stream and water garden. Like other types of algae, string algae thrives on sunlight and excess nutrients like fish waste and decomposing organic matter in the water. If you want to get rid of it, check out this five-step plan designed to get your string algae problem under control.
- Add Plants: Water lilies, water hyacinth, water lettuce and other floating aquatic plants look much nicer than algae, right? These ornamental plants will compete for the food source algae uses for growth, so plant away! A simple rule of thumb is to have 60 percent of your pond covered with submerged, floating and marginal plants.
- Ration Fish Food: Those pellets and sticks are necessary to feed your finned friends, but keep in mind that fish food adds nutrients to the water in two ways: as wasted food that the fish don’t eat, and as waste after the fish digest it. Monitor how much your fish actually eat and cut back if possible.
- Pump Up Filtration: If your filtration system isn’t powerful enough to handle your pond’s total fish load, you’ll wind up with burgeoning algae growth and, in worst-case scenarios, lethal levels of ammonia – neither of which you want. Many filters on the market are rated for ponds containing no fish or minimal fish, so get a filter that is rated for at least two times the water volume of your pond.
- Turn Up Aeration: Beneficial bacteria, like those found in the DefensePAC®, naturally break down fish waste, but they need oxygen to thrive and reproduce. By adding a PondAir™ Aeration System, you’ll boost the oxygen in the water, increase your bacteria levels and reduce the nutrient load, thereby reducing algae growth.
- Use Oxy-Lift™ Defense®: As needed throughout the season, use Oxy-Lift™ Defense® to lift string algae from waterfalls, streams and rocks. Simply shut down your waterfall, sprinkle the powder directly onto debris-covered areas and watch it instantly start foaming. In 24 hours, it will have removed the algae. Be sure to pull out any debris with a pond net.
String algae may seem like a never-ending battle, but you can manage it with these tried-and-true methods. Good luck!
Pond Talk: How often do you need to scrub string algae from your waterfall or stream?
Filed under: Algae Control, Pond Cleanouts, Pondless Waterfall, Seasonal Care, Water Gardens & Features, Waterfall Tagged: | algae, algae on waterfall, hair like algae, string, string algae, why do i get algae