Last updated: August 9, 2021

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Welcome to our big flocculant test 2022. Here we present all the flocculants we have tested in detail. We have compiled detailed background information and added a summary of customer reviews on the internet.

We would like to make your purchase decision easier and help you find the best flocculant for you.

You will also find answers to frequently asked questions in our guide. If available, we also offer interesting test videos. Furthermore, you will also find some important information on this page that you should definitely pay attention to if you want to buy flocculants.


  • Flocculant binds the smallest dirt particles in the pool together and thus makes them filterable.
  • Basically, a distinction is made between flocculants in liquid form and flocculant cartridges, whereby all variants are available in different sizes and price classes.
  • Depending on the size and type of pool, a different type is suitable, such as the use of flocculant cartridges for a pool with a skimmer.

The Best Flocculant: Our Picks

Guide: Questions you should ask yourself before buying flocculants

What is flocculant suitable for?

Flocculant is suitable for cleaning pools. The flocculant ensures that the smallest dirt particles bind together and can thus no longer pass through the filter system.

To keep your pool as clean and hygienic as possible, you can use flocculants to remove even the smallest impurities from your pool. (Image source: / photos-swimming-pool-luxury-swimming-389267)

The use of flocculants is recommended for greenish water, and flocculants should also be used routinely.

Can I also use flocculant with a "float"?

Yes, flocculant can also be dispensed through a float. Unlike the skimmer, this floats in the pool and is used for smaller, non-stationary pools, where the liquid version should be used.

When can I swim in the pool after use?

With the flocculant cartridges you can swim again directly after use.

With flocculant cartridges, the active ingredient is released gradually, so there is never too high a concentration in the pool.

When using liquid flocculant, however, you should wait 3 - 5 hours.

How much does flocculant cost?

There is a wide price range between the different flocculants. Depending on the type and ingredients of the flocculant, the cost varies. The range can go from about 0.7 to 16 euros/100g. If you have a nice pool and want to use it, we think the prices for flocculants are reasonable.

Type Price range
Flocculant liquid 0.7 - 2.1 Euro/100g
Flocculant cartridges 5 - 16 Euro/100g

For liquid flocculant, the amounts range up to 2 Euro/100g, whereby the different manufacturers charge very different prices. Alternative flocculant cartridges are available from 5 euros/100g and are comparatively expensive.

What are the alternatives to flocculants?

There are various methods for ridding a pool of algae and generally getting clear water. Each method has its own advantages and disadvantages.

Method Description
Vitamin C As a home remedy as a powder against green water, VItamin C does not do badly, but a comprehensive binding of the smallest parts does not happen.
Chlorine Chlorine is the number 1 pool cleaning agent, which also helps with optical impurities. However, the smallest particles are not made filterable.

Each method has certain advantages that are not to be sneezed at. Both chlorine and vitamin C powder are good alternatives to clean your pool. However, flocculant seems to be superior to the others in many criteria. Flocculant is also used by many specialists and professionals because it gives the best results.

Decision: What types of flocculants are there and which one is right for you?

If you want to clean your pool with flocculant, there are two alternatives you can choose between:

  • Liquid flocculant
  • Flocculant cartridges

The way the different flocculants are used each bring advantages and disadvantages. Depending on what you prefer and how you want to clean your pool, a different type is suitable for you. The following section will help you decide.

What are the characteristics of liquid flocculants and what are the advantages and disadvantages?

Liquid flocculants usually consist of aluminium hydroxichloride or cationic polymers. Depending on the active ingredient, they can be added directly to the water, or they must reach it via a "float".

These are characterised by the fact that they can be easily portioned in larger pools and when touching up particularly dirty water due to their liquid form and thus ensure an optimal result.

However, you must be aware that you will not be able to use the pool for several hours due to the high concentration. Therefore, you should pay attention to a good time for the application.

  • Suitable for "swimmers"
  • Flexible portioning
  • Ideal for the first cleaning
  • Bathing only possible again after several hours
  • Greater precautions must be taken

What distinguishes flocculant cartridges and what are the advantages and disadvantages?

Flocculant cartridges often use metal salts such as aluminium sulphate and are characterised by relatively easy handling. They are placed in the skimmer at the edge of the pool and release the active ingredient only gradually.

The pool is cleaned and you can bathe in the meantime. They are therefore very suitable for routine cleaning. However, the prices are quite high, and for larger pools you sometimes cannot avoid costs, unlike with the precise liquid flocculant.

  • Suitable for skimmers
  • bathing possible again immediately
  • Inflexible portioning
  • Relatively high price

Buying criteria: Use these factors to compare and evaluate flocculants

In the following, we will show you which aspects you can use to decide between the many possible flocculants. The criteria you can use to compare flocculants with each other include:

  • Liquid or solid
  • Active ingredient
  • Duration until the pool can be used again
  • Filter type

In the following paragraphs we will explain what is important in the individual criteria.

Liquid or solid

Depending on the size and pollution of the pool, you can choose between two types. Liquid flocculants are suitable for small and very dirty pools. Whereas solid flocculants are particularly suitable for clean as well as larger pools due to their slow duration of action and pre-portioned quantities.

Active ingredient

Different active ingredients in the flocculants affect the pool in different ways. Aluminium sulphate, for example, provides an additional layer in the sand filter.

Almost all hotel complexes with pools or public swimming pools use flocculants to clean their pools in order to offer their guests the purest possible water. (Image source: / Skopelos Greece - the Mamma Mia! Island)

This can initially improve the filtering performance, but leads to more sludge and is only effective in a certain pH range. Whereas polymers, depending on the load, can be used regardless of ph.

Duration until the pool is used again

The duration until the pool is used again varies with the type of flocculant. The process of cleaning the pool starts immediately with liquid flocculant, here you can only use the pool again several hours later.

Liquid flocculant is suitable for repairing the pool after the winter.

Flocculant cartridges do not have this problem, but the cleaning process is also slower. Here you can swim again immediately. However, flocculant cartridges are more suitable for routine use.

Filter type

To keep the pool moving and to clean the water, most pools have filter systems. A general distinction is made between sand and cartridge filters. The latter are much cheaper to buy, but cannot be used with flocculant cartridges. Here you should pay attention to the manufacturer's recommendation.

Facts worth knowing about flocculants

How much flocculant should I use?

The manufacturers' specifications vary greatly in some cases. With flocculant cartridges, you can use one cartridge a week for a pool with up to 50,000L of water.

For liquid flocculants, the range is from 10ml per 10,000L of water to 2L per 10,000L of water.

Therefore, pay particular attention to the manufacturer's dosing instructions.

Does the flocculant have to be removed from the pool after use?

No, the flocculant combines with the dirt particles, making them filterable. This means that the flocculant ends up in the filter system with the rest of the substances.

How environmentally friendly is flocculant?

Since the flocculant combines with other substances and is finally brought out of the pool in the filter system, there is generally no danger to the environment. Of course, only if used properly, because flocculants are biocides and thus not entirely harmless to humans.

If you would rather play it safe and use an environmentally friendly cleaning agent for your pool, you can always use vitamin C powder.

Image source: / Service Las Vegas