Green water in the garden pond - what to do against cloudy pond water?

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garden pond

Over time, a layer of mulch settles at the bottom of the garden. It consists among other things of:
  • food remains
  • Fish or animal excrement
  • plant parts
  • Registered contamination
It is therefore organic material that is decomposed by the bacteria in the water. If the muck is whirled up, for example because fish are watering the ground, it acts as a kind of mud cloud in the water and temporarily clouds it. If the muck settles again, the pond water clears up again. If the mulch layer is very thick, even minor movements in the water can cause turbidity. In addition, the water quality suffers. It is therefore advisable to remove the muck regularly or eliminate it. This can be done by a Mulmsauger or by the introduction of Teichschlammentferner. The latter decomposes the Mulm, so that a mechanical removal is not required.


Bacteria are urgently needed for a good water quality in the garden pond and normally ensure that it remains clear. If the balance is disturbed, they can also produce cloudy water in the garden pond. This is the case, for example, when the number of certain bacteria increases significantly - for example, when they decompose a dead animal or larger amounts of dead plant parts. The process manifests itself as a milky cloud or cloudiness in the water.
The remedy is to remove the organic material as quickly as possible. After a few days, the number of bacteria normalizes again.


Algae are found in every pond, but take a special kind of excess, the water is cloudy and green. Responsible for this is the so-called floating algae. If it has ideal conditions for its multiplication, it comes to the so-called algal bloom. The algae multiply so immensely that all the water appears green. With a landing net or normal water filter, the suspended algae can not be adequately removed.
However, green pond water can be prevented and eliminated by other means.


Water Lilies - Nymphaea

Algae control agents are well suited as a short-term solution for the reduction of algae and full pond bloom as well as an additive for cleaning by the clarifier and filter. The preparations are usually liquid and can be added directly to the garden pond. They interfere with the structure of the algae so that they can no longer operate photosynthesis. As a result, suspended algae lack important nutrients and they "starve" to some extent.
When using algae control agents, care must be taken that they are not designed for long-term use in the pond. They serve only the short-term destruction of the algae, but can also have a negative impact on the water quality with repeated use. In addition, it is necessary with existing fish stocking to pay attention to the compatibility of the agent with water dwellers. Otherwise it could cause damage to the fish or even their death.

water plants

Aquatic plants have two advantages in preventing and controlling green water in the garden pond. Larger, faster growing and stronger aquatic plants - such as water plague or millipedes - deprive the water of nutrients and thus become a competitor for the floating algae, which is an important basis for the spread is withdrawn. A well-balanced pond is therefore already designed to prevent excessive growth of algae.
The second advantage is found in large-leaved floating plants, such as water lilies or mussel flowers. They provide a shading of the water, so also reduce an important basis for algae propagation. In addition, they provide protection for the water inhabitants from predators, such as cats or birds. When planting, however, care must always be taken to ensure that the plants can also contribute to the nutrient accumulation of the garden pond by dead leaves or roots. So they do not replace regular cleaning of the water.

silver carp

Silver carp are the floating algae destroyers par excellence, because they can filter the fine algae with their gills from the water and take them as food. However, the peaceful and with goldfish compatible fish are sometimes very large and heavy. Individual copies make it to a length of up to 130 centimeters and 60 kg. In the garden pond, they usually remain much smaller, yet several thousand liters of volume should be present if the silver carp are to be kept. As a swarm fish, keeping at least four fish is appropriate for the species.

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