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How do you get rid of algae from a garden pond?

We've come back from our holidays to find out small garden pond THICK with algae. We've got some plant in and around the pond and a few small fish, but there is NO way the fish we have will survive if we don't get rid of the algae asap. Any ideas/tips greatly appreciated.


  1. First aid treatment - get some jagged sticks (maybe prunings) dip the end into the middle of the algae which I assume is the filamentous variety, and twirl the stick around wrapping the spirogyra around till the stick will hold no more. Long term - go to a garden centre and ask for an algae killer which will no harm your fish. There are also fresh-water mussels which can be introduced to garden ponds and they are algae eaters.
  2. Remove what you can and then dump in a quart of hydrogen peroxide. Your blanketweed will go away. To learn how to keep other algae under control, read my article: http://www.pondlady.com/Articles/pondalgae.html
  3. The best way to get rid off your pond algae is to deprive the algae with the basic elements required for survival. Some of the easiest ways to get rid of pond algae are listed below: The best way is to introduce few water animals like snails, fish, etc. in your pond. The water animals will feed on algae hence solving your problem of pond algae. Besides animals you can even introduce some plants in your pond. These plants will compete with algae for the same nutrients for survival hence making the pond environment less suitable for algal growth. It is advisable to avoid phosphorous rich fertilizers around your pond garden. Phosphorous plays a vital role in sustaining mass growth of the pond algae. Rainwater is the easiest way to transport various nutrients from plants and soil to your pond. Hence in case you have your pond garden at a low region then make sure that it has a protective embankment. You can go for planting different flower plants around the embankment. Growing plants help in absorption of nutrients and water but causes organic litter like dead leaves to enter the pond. Hence make sure that you keep the organic litter out of your pond. You can even create a buffer strip around your pond. Buffer strip mainly consists of high grasses and shrubs. The buffer strips checks water and other nutrients from entering the pond. Though you can add poisonous algacides in your pond but it can be dangerous to other desirable animals or plants. Besides that algacides causes mass death leading to sudden drop in the oxygen levels of the pond. Hence it is better to go for safe and effective home remedies to get rid of pond algae.
  4. Wish I knew how big of a pond it is that you have. The pond that I made is 5 foot long by 3 feet wide and 3 feet deep. Here is what I did,now bare in mind I only had algae on the sides. I wiped down the entire sides of the pond,did a water change. But then my pond was cloudy. I waited 2 days and went and got a small bottle of clear all(sold in aquarium stores,cost $2). 3 days of adding this and I have not had a problem since. Crystal clear and can see everything in the pond. And this is with a pond that is wide open to the sun, getting 12 plus hours of sunlight daily.Plus my pond has a sponge filter and a power head to circulate the water.We just went through 1 of the hottest July's on record with temps in the low to mid 90's just about every day. There is also barley straw that can be used and is sold at pond centers. But I heard it takes about a month before seeing any results. Hope this helps
  5. There are 2 main types of Algae that affect ponds - the type in long filament strands, and the floating type, making a kind of pea soup type water. Whichever type you have, there are methods to remove it and also prevent it from becoming such a problem in future. The clumping Algae, commonly called Blanket Weed, is removed most quickly if done manually, twirling it around a stick. Barley straw will stop Blanket weed from growing, and I find this is most effective if added as a liquid extract, rather than submerging some straw. You can get this from aquatic suppliers. The best product I've used is Blanket Answer, made by a co. called Cloverleaf, see it here, available from many stockists - http://www.warehouse-aquatics.co.uk/index.php?p=product&products_id=4871&cid=1 This is fully safe for wildlife and fish. The floating Algae that's suspended in water can be removed by a pump system, though this does mean a purchase. There are also treatments that you can add to your pond that will kill it off. The main things that Algae needs to grow are light, nutrients and warmth. If you restrict the light and nutrients then it will not be able to flourish. Any waste, such as dead vegetation or animal manure, such as fish droppings, will break down into nutrients that will make it grow - thus if you minimise such waste, by clearing off dead vegetation and not allowing it to rot in the water, will reduce nutrient levels. Also, check that there's no run-off water entering the pond from your garden, as this will carry nutrients within it. Look out in autumn for fallen leaves etc, and prevent these rotting, as they will feed algae next year. For submersed algae treatment, the product that I've had most success with has been Nishikoi, 'Goodbye Green Water', such as available here - http://www.capitalgardens.co.uk/goodbye-green-water-pond-treatment-p-21265.html A pond filter will generally improve your water clarity too, so I'd recommend that you get one if you're not using one at present. These will help with the processing of waste in the water too. If you reduce the potential for light and nutrients on the water, and use one / both of these treatment products then your water should continue to improve, after manually removing the blanket weed. There's a yahoo answers question here that covers some information about waste in ponds, and Algae treatment, though there is some duplication - http://uk.answers.yahoo.com/question/index?qid=20090731091548AAiIJTu Hope this helps. Good luck! Rob