Green Slime on Surface of Pond?

We have a green (almost a fluorescent green color) algae-like material covering the whole surface of our pond. If you put your hand in it to scoop it up it looks almost like a bunch of tiny seeds and slime that sticks to your hand. Each year it gets worse and this year there are actually plants growing about 6-10 inches high on it. It hardly resembles a pond any more. Does anyone know what this is and how to get rid of it?


jho from Chassell

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By (Guest Post)
October 24, 20080 found this helpful

It sound like algea. Does your pond have an airator pump/filter? If it does clean or change your filter. Airating the water will slow the growth of the algea. Other water plants will also use up the CO2 thats forming in your water.

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June 15, 20190 found this helpful

The material that you described that looks like small seeds is actually a pond plant called duckweed. As a previous replier indicated it is algae. They are correct as well. It is likely that you have both algae and duckweed. There are tons of articles available that advertise particular products to purchase for cleaning it out or you can go to sites for DIY depending on your personal preferences, time and available financial resources. Good Luck!!!

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October 24, 20080 found this helpful

I agree with the last poster. This isn't "algae-like", it's ALGAE! Aeration clears it up but this requires a system of some sort. Google 'pond aeration' and you'll find info.


This particularly heavy time is called the algae bloom. My husband and I just attended a seminar on this subject. I think you could go to OSU web site and get info. They are the ones who sponsored the seminar.

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By chris t. (Guest Post)
October 27, 20080 found this helpful

Every pond or fish bowl gets some sort of algae on it or in it. Depending on the water chemistry, you get different kinds & colors of algae. If you have fish in the pond, you have to be more careful, but water movement has a lot to do with oxygen content of the h2o. If you've ever looked at running streams & rivers, they are clear, then algae grows like small plants on the rocks. What you need to do is get a pond pump & MOVE the h2o. If you have some sort of a filter attached to it, that will help, too.

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January 17, 20090 found this helpful

I had a very bad algae problem with my pond even with a filter running and lots of aeration. I tried a lot of things but the one that worked was an UV filter. It is an ultra violet filter that attaches to my water line that runs into my filter from the pond.


Since I've been using it for the last three years I have not had an algae problem at all. Just be very careful not to touch the bulb when you are installing it. It works. It also does not harm by fish.

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June 23, 20100 found this helpful

I suggest you go on the Pond Lady website. Very informative. I think your water isn't moving enough. They say if your system is balanced with equal plants, aeration, snails, etc., you shouldn't ever have trouble. Something isn't in sync. Do you have something in there to control/eat the algae? Snails? Catfish? Fish?

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