Tips against algae in the mini-pond

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Algae in the mini pond are an annoying problem. As beautiful as the small waterholes in the garden or on the terrace are, the care can quickly become quite complex, especially when green cover and algae spread in the water. A mini pond is a closed, standing water system in which there is virtually no exchange with fresh water. A biological balance can not be set in such a small space. As a result of pollen, leaves and dust particles, more and more nutrients accumulate in the water, leading to intensive algae growth. In the end, against the algae colonization in addition to manual fishing often helps only the chemical club or a complete water exchange. We give you some tips to prevent algae growth in the mini-pond.

Remove algae

Algae can easily form in the mini-pond as there is no exchange of water

The ideal location

Like most plants, algae grow well in high sunlight. Therefore, it is advisable to choose for the mini-pond a partially shaded to shady place. A maximum of three hours of sunshine per day are ideal. The luminous efficacy should be sufficient for the water plants used, which usually require little light, but prevent the algae from propagating. Heat also provokes algae growth. A cool place, where the water does not heat up quickly, therefore also helps prevent algae growth. On a sunny spot, shading with a parasol works wonders against algae growth in the hot midday hours. In addition, set up the mini-pond so that you can easily reach all parts of the pond from the outside - this facilitates the care.

Mini pond in the shade

For small ponds a shady location is ideal

The right water

Especially for a mini-pond, in which the total amount of water is limited, the use of rainwater is recommended. This contains virtually no nutrients that promote algae growth. Use only "pure" rainwater, which is not contaminated by deposited dirt from the roof and gutter. Alternatively, the rainwater can be filtered before being let in. If tap water is used, it should at least be low in lime.

Avoid overheating

A mini-pond is usually less than one square meter in size. As a result, the water in the pond heats up very quickly when exposed to sunlight and creates a lack of oxygen. For many aquatic plants this is a problem, for algae but the purest Eldorado. Buckets, barrels or tubs made of bright materials that store little heat (for example made of wood) are well suited for mini-ponds.


Wooden jars are especially good for mini ponds as they do not heat up so quickly

Black mortar tubs, metal tubs or vessels lined with dark pond liner will heat up faster. If you have some space, use it and use the largest possible vessels to accommodate a larger amount of water. To prevent overheating, regularly ten to twenty percent water can be removed from the pond, for example for flower-growing, and replenished with cooler fresh water. Also, replenish evaporated water regularly. This artificial water exchange reduces the multiplication of algae in the mini-pond.

No earth in the mini-pond!

Never use normal potting soil when planting your mini-pond. First, it floats up and clouds the water. Secondly, the partially pre-fertilized potting soil is far too nutrient-rich for the pond. For the supply of aquatic plants, therefore, only special Teicherde or a nutrient-poor clay-sand mixture may be used, and also hereby you should be extremely economical. Too many nutrients are the main reason for a heavy algae load in the mini-pond. Therefore always keep an eye on the nutrient supply in the water.

Substrate for the mini pond

Clay, sand and limestone are the best substrate for plants in the mini-pond

The right plants for the mini-pond

When planting your mini-pond, pay attention not only to the look, but also to the function of the different aquatic plants! As in nature, it is best to counter algae colonization in mini-ponds with suitable competing plants. Underwater plants such as hornwort (Ceratophyllum demersum), water plague (Elodea), millipedes (Myriophyllum spicatum) or water feather (Hottonia) produce oxygen and thus improve the water quality, which can prevent algae growth, because algae are most comfortable in low-oxygen, over-fertilized water.
Tip: Plant floating plants such as water salad (Pistia strationes), also called shell flower, or duckweed (Lemna). These heavy eaters drain nutrients from the water and algae, as well as shade the water and counteract excessive evaporation.Do not put too many plants in the small pond, because it should still remain visible water surface, and remove dead plant parts and registered foliage and pollen immediately. This will prevent the decomposition of the plants, which in turn would lead to the release of nutrients into the water.

Duckweed and high background planting

Duckweed and the high background planting provide shade

Pay attention to the pH value

Normally, the water in a mini-pond has a pH of 6.5 to 7.5. An incipient growth of algae extracts the vital CO2 for the aquatic plants from the water and the pH increases (so-called biogenic decalcification). As the pH increases, it must be adjusted downwards to protect the other aquatic inhabitants. However, this does not require the same chemical aids as phosphoric acid. To lower the pH, a little vinegar, pom pomegranate or sachets of peat granules also serve well. Check the pH in the water regularly (in the morning the pH is naturally lower than in the evening!) And do not allow it to rise above 8. A rapidly rising pH value may indicate an algal bloom. Attention: Not the high pH makes the algae, but many algae ensure a high pH!

Water features keep the water fresh

Water feature in the mini-pond

Water features ensure even circulation and prevent algae growth in the mini-pond

What is not recommended for larger ponds, in the mini-pond has a very positive effect on algae: Small fountains, fountains or bubblers circulate the water and contribute oxygen. By the way, they cool the pond water. Since algae prefer dormant, warm waters, a mini-fountain can be very useful in algae defense.

Video Board: 3 Tips to Crystal Clear Pond Water | How to Kill Green Algae.

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