Koi Ponds: Green, Murky Ponds & Algae

Your's: A crystal clear koi pond

If you keep koi and you really want to enjoy your koi collection, you will want the pond water to be as crystal clear as possible. To achieve this, all you need do is avoid all the causes of murky water. These are some of the most common causes.

Excessive algae growth

Algae bloom is one of the most common causes of cloudy, green or murky water. It is most problematic in summer, when the weather is warm.

To minimise the growth of algae, you can plant around the pond to shade it, and also plant inside the pond.

Water lilies are great for providing surface shade from within the pond, while oxygenators that float in the body of water successfully compete against algae for space in the pond.

At the same time, these valuable plants absorb the dissolved mineral salts and carbon dioxide that the algae thrive on, thus helping to keep the water crystal clear.

Another solution is to install a UVC (a UV clarifier) that literally kills the algae. Relying on UV radiation to do the job, a UVC is fitted between the pump and the filter.

Its active mechanism is a UV light bulb which simply needs to be replaced once a year.