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Harry Potterish 12-04-2012 06:43 AM

Treat Green Water in a Pond
Hello Friends,

Having a pond creates a soothing feature and a lovely focal point in the landscape. After all the work of designing a pond, building it, choosing plants and fish and allowing the pond to reach a natural balance, it can be a shock to walk out one day and find the water has turned into a murky green pea soup almost overnight. This is commonly called green water and it can be quite a shock when you first see it. But don't fret.

The first thing you need to know is that there is absolutely nothing wrong with your pond. Green water is a perfectly natural part of the pond cycle. When water starts to warm in the springtime and the sun's rays shine down directly, a single-celled free-floating fine algae 'blooms' throughout the water. Although it looks disturbing, the algae will harm nothing and, if your pond is properly aerated and has a good PH balance, it will go away on its own as the water continues to warm.

Thanks and Regards,
Harry Potterish

AlexJohns 12-26-2012 07:07 AM

Re: Treat Green Water in a Pond
Hello Members,

Green water is caused by the accumulation of millions of single cell, microscopic spores of green algae suspended in the water. Single cell algae have the ability to make your crystal clear pond water into what looks like pea soup with limited visibility. Algae that causes green water is not to be confused with string algae, which looks like a stringy weed that bunches together and often clogs filters and drains.

Thanks and Regards,
Alex Johns

muhphd 09-26-2013 02:48 AM

Re: Treat Green Water in a Pond
Green ponds are also indicative of over nitrification of the water table. If you have too much algae you will choke out the other organisms besides less desirableness such as mosquito larva and tadpoles. Best to check the PH of the water and the nutrient levels. If it's getting lawn runoff then stop using fertilizer for a while and see how it goes. You may also plant some trees over the pond to limit the light the algae is using to grow.

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