String Algae in Summer

Prevention is Key!

String algae can be a real pest. It's most often trouble in late winter or early spring and when it really starts to heat up in the summer. We've noticed it is starting to grow like crazy here at the store and at our homes.

The photo above is not current, this is usually what it looks like in the spring but it can still get bad in summer too. Have no's not unhealthy for your pond, but it's not pretty -- that's for sure! So let's talk about preventing it first, then treating it.


  • In the pond, it's easy to prevent. We keep lots of aquatic plants in our ponds and use Remove Away every week. The combination of the two keep algae in the pond in check with very little issues. You may have to use more Remove Away when the water temps rise, but the algae in your pond will not become any more than a slight covering --- which is good.
  • Keeping algae "food" to a minimum is key as well. Fish waste, excess fish food, dead plant leaves, anything organic that's breaking down in your pond (i.e. "muck") is prime algae food. Keep an eye on your fish populations, how much (and WHAT) you feed your fish, and trim aquatic plants as you see leaves die.
  • As Remove Away works to keep your string algae from growing, it will begin to die off. If you can, remove long strands of string algae by hand to prevent massive muck accumulation. Be ready to clean your filters more often as that dead algae begins to break apart!
  • Be sure to use BioClear and Clean weekly also to break down the algae as it's dislodged from your pond. If you don't, that algae will decompose and create more algae!

Remember this: it's important to starve the algae. By providing less nutrients (fish waste, uneaten fish food, leaves, decaying plant materials, etc.) for algae, algae will grow less. You can also starve algae by adding more aquatic plants to compete with algae.

We're here to help if you have other questions about algae or other pond issues!

Written by Cool Ponds co-owner, Staci


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