Pool Flocculant Instructions (How to Use The Pool Floc)

The flocculant is a miracle for crystal clear water in your pool. But how is the flocculant dosed and used for pool maintenance?

The correct application of the flocculant in the pool is combined with a proper filter system and a skimmer. 150 to 200 ml of flocculant are used in the skimmer for every 10 m³ of pool water, but the pH level should be set to 7.2 – 7.6 beforehand.

This article explains how the different flocculants work, how they can be used in your pool, and what you can expect when cleaning your pool.

Pool flocculant instructions

Poly-aluminum hydroxide-chlorides (PAC) are used in flocculants and are available as solid tablets, cartridges, or granules and as liquid form.

Both forms – whether solid or liquid – are to be understood as concentrates, although when using solid agents, you may have to accept a longer dissolution time in your water.

The choice for pool cleaning is up to personal preference, as all options dispense the concentrate.

In practice, however, the flock pillows and flock tablets in the pool have particularly proven their worth.

In the following chapters, you will find out how the individual flocculants are used in the pool.

How to use liquid flocculant in your pool

The correct dosage and use of the liquid flocculant is crucial for the cleaning result.

Liquid funds can be added directly to the water, but you should always follow the instructions so that nothing goes wrong.

  1. Measure and, if necessary, correct the pH level in your pool. The pH level should be between 7.2 and 7.6, as the flakes dissolve at a pH level above 7.6.
  2. Then 150 to 200 ml of flocculant is dosed per 10 m³ of pool water – depending on the degree of contamination and the concentration of the flocculant. Read the information on the packaging.
  3. While the filter system is running, pour the flocculant directly into the return flow of your pool to avoid splashing.
  4. After 30 minutes, the filter system is switched off for 30 to 60 minutes.
  5. Then the filter system has to influence the water for 6 to 8 hours – alternatively, leave the pool to rest overnight so that the agent works.
  6. The flakes deposited on the floor are drawn with a pool vacuum – set the filter system to emptying.
  7. Put the sand filter system on filters again – done.

The power of the sand filter system should not be increased when using the pool flocculant directly in a sand filter.

Otherwise, the fine suspended matter will not be efficiently bound and filtered out.

Remember that the flocculation in your pool should be repeated over several days, as with a single application of the flocculant, only about 50% of the pool water is captured, and dead zones are present.

After using the pool flocculant for a few days, the sand filter capture 90% of the dirt in your pool, so use the flocculant regularly to avoid milky pool water.

How to use flocculation pads in your pool

Flocculant pillows are a popular and reliable method of continuously generating free flocculant in your swimming pool.

In contrast to the liquid swimming pool flocculant, the risk of unwanted white flakes forming on the pool floor is reduced.

But how are flocculation pads used in a pool?

The flock pads are usually placed in the skimmer or the sand filter system – the skimmer is the better choice.

But remember: You have to change the flocculant pad every 10 to 14 days to get crystal clear pool water.

By continuously filtering the water, the small flakes are held back by the filter.

Should some flakes be visible on your pool floor, you have to suck them off with a pool vacuum cleaner.

When using the flocculation pillow in your skimmer, make sure that it is cleaned occasionally and, if necessary, replaced with a new flocculant pad.

Otherwise, the water will not flocculate efficiently enough, and the pool may become cloudy.

Tip: If you use a flocculation pad and want to put it in your skimmer, you should not touch the pillow with your bare hands – use gloves to avoid direct contact.

How to use flocculant granules in your pool

Pool flocculants are also available as granules, but the instructions on using them do not differ from the already liquefied flocculant.

In the case of flocculant granules, it must be ensured that they are first dissolved in a bucket full of water and then added to your pool – direct contact with the pool water is not advisable.

Put the granules in a filled bucket of water and stir the mixture with a stick so that it dissolves faster. The mixing ratio should be 10:1.

Then the liquefied flocculant granulate is poured – while the pool pump is running – at different points over the pool edge into your pool or directly into the return flow of the filter system.

All further steps can be found in the instructions above on using the liquid flocculant.

Tip: The granules are easy and safe to store. You can find out more about the correct storage of pool chemicals on my blog.

Use flocculant tablets correctly

The flocculant tablets should preferably always be used in a skimmer.

But you can also use the pool flocculant without a skimmer. All you need is a floater.

The pool floater releases an even distribution of the agent, whereas a flocculant cartridge can be attached to the pool ladder.

I recommend hanging the floater with the flocculant tablets in the flow of your pool pump – simply use a rope.

The agent is evenly distributed in the water when the pump is running, and your swimming pool can be used again after just 6 to 8 hours.

Unfiltered particles sink to the bottom. Then these are sucked up with a pool vacuum.

Tip: To support the filtering, your filter and pool should have been cleaned of visible dirt with a net and pool vacuum.

Instructions for using the flocculant

  • A swimming pool flocculant should never be added to your pool directly from the product packaging.
  • If there are no detailed instructions for using the flocculant, you can use the dosing information given above as a guide.
  • When using it, note that different superflocs should always be added to the pool separately and never mixed. The reason for this is the different dosage levels of the manufacturers.
  • The flocculant pillows contain a specific dose of flocculant, which differs depending on the provider. Read the manufacturer’s recommendations on when and how to replace the skimmer’s flocculation pad.

As a rule, one application of the flocculant in your pool is enough for one week so that the water is filtered and remains clean.

Then the application must be repeated.

One should never forget: Flocculants are added to the water and never reversed.

The usage of swimming pool flocculants without a skimmer is also suboptimal and not recommended.

Tip: You can read more about how flocculation works in the pool in my blog. Just follow the link.

When was flocculation in your pool successful?

The successful use of the flocculant in the swimming pool is sometimes not immediately visible to the naked eye.

But it can also happen that the flocs have dissolved in your pool if the pH level has risen above 7.6 during flocculation.

Do not be deceived by the visual appearance of your pool water.

You can see from the manometer display on the filter system how the flocculant has been applied.

To do this, follow the backwashing process to see whether the pressure rises.

If the pressure rises rapidly by 0.3 bar, this indicates the accumulation of dirt on the filter surface.

So the flocculation was successful.

Tip: If the pressure rises quickly by 0.3 – 0.5 bar, you should urgently backwash the sand filter system. Otherwise, the filter will break through, and the dirt will get back into the basin.

In my blog, I explain how to do the backwashing quickly and easily. Simply click on the link to access the article.

FAQ: Questions and answers about the flocculant

Here, you will find the reader’s most frequently asked questions about the pool flocculant and its use in swimming pools and whirlpools.

How to use the flocculant without a skimmer?

If you operate a pool system without a skimmer, you have to use the flocculant differently.

If you don’t have a skimmer, the liquid flocculant can be poured into a bucket of water and mixed with a stick.

Pay attention to the dosage mentioned above of the flocculant and avoid any skin contact.

Then the mixture is poured into the pool, the better method using a skimmer.

It is even easier to use the flocculation cushion in a floater.

However, this method does not always work optimally, as it can easily lead to overdosing of the flocculant – the result is irritation to the eyes and skin.

How often do I use the flocculant in a pool?

The time interval between using a flocculant in the swimming pool depends on the manufacturer and the season.

But how often must the flocculant be used as a rule of thumb?

With the daily use of the pool, the flocculant’s weekly use is also recommended to enjoy the highest possible water quality.

The flocculation in your pool can be repeated up to five times in extreme cases with strong algae growth.

How often the procedure should be carried out depends on your water condition.

When is swimming in your pool allowed after using the flocculant?

After using any pool chemicals, you should not step into the water immediately.

But when can you bathe again after the flocculant has been used?

The guideline says that you should generally wait at least 6 hours before you can swim in the pool again.

Of course, this value differs depending on the dosage and pool size.

However, it is recommended to use the flocculant in the pool in the evening and let the sand filter system rest.

Due to the natural circulation in the water, the flocculant should be well distributed after eight hours, and you can swim safely in your pool the next day.

With a slowly running sand filter system, the flocculant is better distributed in the water, and you can theoretically swim again earlier.

If the pool filter runs overnight, remember that the volume may not legally exceed the value of 35 dB(A) – this corresponds approximately to the importance of a room fan.

Do you have any further questions about my instructions on using the flocculant in your pool?

Contact me at @contactswimfool on Twitter, Facebook, Pinterest, and Co – I’ll be happy to help.

Have fun with the water treatment!

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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.

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