Can you use pool water for watering? Is Chlorine Water Dangerous?

A paddling pool for the children or a garden pool is a real pleasure in summer, but only with clean water. Chlorine is often used for this. But what happens to the chlorine water when the pool is emptied in autumn? Can it be used to water flowers or even crops that are used for human nutrition?

Is chlorinated water harmful to plants?

One often reads about plants that tolerate chloride or that some plants even need this substance. However, do not confuse the term with chlorine compatible, because chlorine and chloride are not the same. Most plants are rather chlorine intolerant. If you want to use pool water to water your crops, then also bear in mind that the chlorine can accumulate in the fruit and then eat it with it. That’s definitely not what you want.

Can I remove chlorine from pool water?

Chlorine decomposes itself from the water. A removal is therefore not necessary. But it takes time to break down, so don’t bring freshly chlorinated pool water directly to your plants for watering, not all are chlorine tolerant.

What is the difference between chlorine and chloride?

Chlorine is a yellow-green toxic gas that does not occur in nature in its pure form, but only in combination with other substances. It can be obtained by electrolysis and was often used as a bleach in the past, and was even used as a poison gas during the First World War. Today, chlorine is used for disinfection or for water treatment.

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Chlorides are chemical compounds with chlorine that also occur in nature. In aqueous form, chloride is absorbed by plants. An oversupply is also called toxicity. It occurs more often than undersupply. Crops can be divided into four groups based on their chloride tolerance:

  • Chloride loving plants
  • Chloride-tolerant plants
  • conditionally chloride-tolerant plants
  • Chloride sensitive plants

How do I determine the chlorine level in pool water?

The exact chlorine content in the water can be verified with complex and expensive tests. You have to decide for yourself whether this really makes sense. But you can also follow a common rule of thumb. This states that water that has been chlorinated according to regulations contains less than 0.3 mg/l chlorine after 48 hours and is therefore considered harmless. However, the exact duration depends on how the chlorine was administered. Before you use your pool water for watering, you can wait a few hours more to be on the safe side.

Are there different types of chlorine?

There are several ways to chlorinate pool water. The material is always the same, but the consistency is different. This releases more or less chlorine and the duration of action also varies. You can chlorinate your pool water with the following methods and dosage forms:

  • Chlorine granules
  • Chlortabletten
  • liquid chlorine
  • as shock chlorination

Chlorine granules

Chlorine as granules can be dosed particularly well due to the loose form and the chlorine content in the water can thus be adjusted quite precisely. The granules also dissolve faster than tablets, so the chlorine is broken down more quickly. Accordingly, you can use chlorinated water with granules for watering.

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Chlorine in tablet form breaks down rather slowly, but quite evenly. If the water is agitated, for example by swimming or romping in the water or by filter pumps, the tablets will dissolve a little faster. The dosage cannot be set as precisely with chlorine tablets. If you want to use pool water chlorinated with tablets for watering, then you should not chlorinate for some time beforehand or measure the exact chlorine content and then determine the watering time.

liquid chlorine

Like granules, liquid chlorine can be dosed very precisely. In contrast to solid forms of chlorine, however, liquid chlorine does not have to be broken down at all. The chlorine content drops continuously immediately after chlorination. Depending on the dosage, the chlorine water is suitable for watering in the garden just one to two days later.

shock chlorination

Shock chlorination is chlorination with a very high concentration. It is only carried out in the case of above-average dirty water if the water is to be cleaned again quickly. It is hardly suitable for personal use, as it can lead to health problems. This chlorinated water must not be used for watering for at least a week. It shouldn’t even seep away there because it can harm the plants.

Pool water for pouring – what do I have to consider?

Be sure to pay attention to legal regulations and stick to them, because watering with process water is not permitted everywhere. Information can be obtained from the water association or the Water Resources Act. In general, chlorinated water is classified as so-called dirty water and must therefore be disposed of via the sewage system. It is only considered harmless at a concentration of less than 0.3 mg/l.

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You certainly don’t want to flood your garden, so you shouldn’t just let unpolluted pool water run into or over your beds. Do not water your plants more than usual or you risk rotting the roots. In this way, of course, it takes some time for the pool to be completely emptied. It is essential to ensure that the draining water does not flow onto your neighbor’s property, this will prevent unnecessary trouble.

If you want to empty the pool very quickly, it may make more sense to simply let the water seep away in a corner of the garden or direct it into the sewer. In this case, it would be ideal to transfer it to a cistern from which you can water your garden for several weeks.

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