Why are There Maggots and Other Little Laerve in Your Pool

Maggots in the pool are nauseating and have no place in the water. But how do the larvae get into the pool, and how do you get rid of them quickly?

A cover for the pool and a raised crown will prevent the maggots from crawling into the pool. If there are already maggots in the pool, they must be removed using a pool vacuum. A pool shock is used to kill the larvae to be on the safe side.

Getting rid of the maggots in the pool can be tricky, but the following tips can help you get a grip on the problem.

#1 Use a pool cover against maggots in the pool

The secret of where the maggots end up in the pool remains a mystery to many pool owners.

It would be helpful to know where the little white worms come from, but we need to act now.

Shield the pool with a suitable pool cover against the maggots and prevent them from falling over the pool’s edge into the water.

Ideally, you use a solar pool cover to heat the water simultaneously.

But only cover your pool with the solar tarpaulin when it is colder outside or rain is to be expected – of course, a standard garden tarpaulin of sufficient length is also allowed.

Before you cover your swimming pool, you should first remove any maggots from the water. This is important in order to be able to tell the next day whether the larvae are crawling to the pool from outside.

Tip: Are the little white worms really maggots? Is there a gross risk of confusion with meadow worms and white grubs?

Stretching a solar cover over your pool is not always easy. The problem can easily be solved with a practical pool roll-up system.

Tip: When wintering in spring, there may be many maggots in the swimming pool because the pool was not properly covered.

Therefore, the pool should always be appropriately covered when wintering and checked in the meantime.

#2 Remove the maggots in the pool with a pool vacuum

Insect larvae have no business in your pool and must, like all other organic foreign matter, be removed from your pool as quickly as possible so that it does not become cloudy.

If the maggots in your pool end up in the water despite being covered, a pool vacuum is suitable for sucking the animals off the pool floor.

The hydraulic pool vacuum is operated via the sand filter system. If you use a small pool without a filter system, you can use a cordless vacuum cleaner.

Automatic pool robots that can clean the pool independently are far more practical. The pool cleaning robot would be beneficial with a frequent problem with maggots.

Tip: The maggots should not be removed via the floor drain – if available. If you don’t have a floor vacuum, you can try removing the larvae with a pool net.

#3 Perform a pool shock if you see maggots in the swimming pool

It is usually not due to poor water maintenance in your pool if maggots are present in the water.

Nevertheless, it is necessary to recheck the water balance and, if necessary, to optimize it.

Before we restore the water balance, a pool shock should be done first. You can find detailed instructions under the link.

As is often claimed in forums, the chlorine shock will not solve the problem with maggots in your swimming pool.

We don’t want to kill the maggots with a pool shock either – the worms perish by drowning.

The pool shock treatment with chlorine is used to disinfect the pool water and prevent cloudiness in your pool.

The prerequisite for a pool shock is that the existing maggots have been completely removed from your pool – also check the basket in the skimmer and empty it daily.

Tip: Use non-stabilized chlorine for shock chlorination. But you can also use active oxygen or another disinfectant like bleach shock.

#4 Check the gap at the edge of the pool for leaks

I read about an incident where maggots appeared after moving the curbs. A gap remained open between the stones and the top edge.

A dead animal like a mole may be lying in the gap, from which the maggots form and end up through the gap into your pool.

But leftover food from construction workers can also cause the problem.

In this case, you can try to rinse out the gap with the garden hose and check whether maggots are washed out.

If nothing can be seen after cleaning, you have no choice but to constantly remove the maggots with the pool vacuum and wait until they have done their job.

Tip: Check the surrounding property for a dead mole, mouse, or other small animals. Even a piece of salami is enough to produce dozens of maggots – Follow your nose!

#5 Increase the pool edge against maggots and worms

The maggots often crawl over the pool’s edge into the water and bob around there until they drown.

In this case, the source can be an overfilled organic bin.

I’ve already seen maggots find their way over the edge of the bin into the open in summer temperatures.

The solution: If the pool is leveled with the ground, it is easy for crawling animals to get into your pool. The problem can be eliminated with a raised pool crown.

Of course, a raised pool edge is still no guarantee that no maggots will land in the pool water, but at least it can minimize the problem.

Tip: Limestone laid out around the pool should help against worms in the pool. Maybe this method also works with maggots?

#6 Insecticide as a last resort against maggots

I do not support this method, but for the article’s completeness, I want to briefly explain the use of the insecticide against the maggot invasion in your swimming pool.

If water beetles in your pool and other crawling animals are still a problem – after you’ve tried everything imaginable – then the use of an insecticide may help.

For this purpose, the area around your pool basin is sprayed, hoping that the maggots do not come near the pool.

Unfortunately, this method also drives away and kills all other insects such as wasps and bees at the pool.

Therefore, find out from your local authority whether using an insecticide is allowed – maybe a company needs to be hired.

As already mentioned: Use the insecticide only in exceptional cases because the maggots in your pool are not dangerous, just a little disgusting.

FAQ about maggots in the swimming pool

Here you can find more questions and answers about the problem with maggots in the pool.

Are maggots dangerous in the pool?

Maggots are harmless to people in the pool, but if they stay for a long time, they can imbalance the water balance.

A maggot is only harmful if it penetrates through wounds under the person’s skin, but this should not happen when staying in the pool.

Why are maggots a problem in the pool?

The hygiene in the pool has to be good, and any dirt disturbs the water balance.

If the maggots stay unnoticed in the water for a long period, germs form, which can only be removed with a suitable disinfectant such as chlorine or active oxygen.

How was the pool contaminated with maggots?

The main cause of how the maggots end up in a swimming pool often remains an unsolved mystery for many pool owners.

Some of the causes can be:

  • There is probably a rotted small animal in the garden.
  • There is a dead frog in the basket of the skimmer because the basket is not emptied too often.
  • The cat brought a mouse home and left it in the corner somewhere.
  • Is there a tree hanging over the pool? Perhaps there is a decayed animal on the tree, and the maggots fall from the tree into the pool.

Always follow your nose, then the chances are good to find the cause.

Do you have any other questions about maggots in the swimming pool?

Contact me on Twitter or Facebook at @contactswimfool. I will answer all your questions.

Have fun swimming!

Photo of author
Hi. I'm Max Berg. I've been in the pool industry since 2015 and have always felt drawn to water. I'm the author behind swimfool.com, where I share my years of experience in pool maintenance and give helpful tips on keeping a swimming pool or hot tub clean. My tips reduce the costs of water treatment and protect the environment.

Keep Reading

Top 5 Pool Heater in 2022

There are various pool heaters on the market that can heat the water. But which pool heater is the best and what do you have…