Pond loses water - capillary lock can help

Pond loses water - capillary lock can help

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Creating a garden pond is a lot of work. All the better when everything is done. But what if the pond loses water? Is the pond leaking?

There can be various reasons for water loss in the garden pond. The most obvious is a leaky pond liner. A defective filter system or an incorrectly installed or even missing capillary lock can also cause your pond to lose water. Likewise, you will have to reckon with a falling water level in very warm months without much precipitation, because a lot of water evaporates.

To put an end to unnecessary water loss, the first thing you need to do is find out exactly what is causing the water loss. To do this, proceed as follows:


Check the bank area of ​​the pond. If it is swampy, this is a sure indication of the so-called capillary effect: the contact of water and shore is comparable to a wick. Because the soil pulls the water out of the pool just as a wick would do to balance the liquid. A capillary barrier provides a remedy here.

Tip: Even if the pond liner has been placed poorly, these folds often act like risers, in which the water then rises above the water level and thus causes a loss for the pond.

Capillary barrier

The capillary barrier separates the pond from its surroundings. On the one hand, this prevents it from drawing water from the pond. At the same time, it also prevents soil or fertilizer from getting into the pond and causing over-fertilization.

If you would like to set up a capillary barrier, you have the following options, for example:

  • Slabs of concrete or wood as a capillary barrier
  • Digging with gravel
  • Edge of the pond system
  • Fix the capillary barrier on the terrace

Slabs of concrete or wood as a capillary barrier

The easiest way to set up a capillary barrier is to place concrete or wood panels around the pond and attach the pond liner to it.

Digging with gravel

Make a 20 cm wide and deep trench parallel around the pond. Then cover it with pond liner and fill the trench with gravel.

Tip: plan about 60 to 80 centimeters more on each side for the pond liner and only cut off the excess liner when the pond is completely filled and the gravel is already in the trench.

Edge of the pond system

In the trade you can get plastic profiles by the meter. Usually these are between 14 and 20 centimeters high. To install such a pond edge system, plastic posts are hammered into the ground at a distance of 50 to 60 centimeters around the garden pond and the pond belt is attached to it with screws. Then you only attach the film to the pond edge system.

Fix the capillary barrier on the terrace

If your garden pond borders your terrace, it makes sense to attach the capillary barrier to it. The easiest way to do this is on wooden terraces. To do this, loosen the first row of terrace serving and simply attach the pond liner to an existing cover panel. To do this, simply pull the film over the cover. Then screw the terrace board back onto the cover.

Tip: If your terrace has a slope in the direction of the pond, you should create a raised edge through a profiled wood over which you pull the pond liner.

If you have a terrace with stone slabs, you must first remove the first layer of slabs. Then lay the film up to the second row of panels. When the pond liner is free of wrinkles, put the removed plates back in their place. In this way you attach the film between the first two rows. Then cut off the excess film so that it closes with the stone slabs.

Damaged filter system

If the bank area is dry, you should first check the filter system. Because leaky filter systems and defective hose connections can be the reason for the water loss. To do this, you should switch off the pumps and monitor the water level. If this remains constant, a fault in the filter system is very likely. You should take a close look at the system and replace faulty parts.

Broken pond liner

If you can also exclude the filter system as the cause, it is relatively likely that the pond liner has leaked. To check this, you should monitor the water level over a longer period of time and mark the current water level on the slide every day. If the water no longer seems to sink, you at least know at what height the hole is. Now you can scan the pond liner in search of the damage.

If you could spot the leak, you can start repairing the pond liner. To do this, you must first dry and clean the affected area. You can then cut out a generous patch from the remaining film and stick it to the hole.

Tip: However, make sure that you use the right adhesive for your pond liner.