The DPD testing

The DPD testing

Water treatment in pools. The DPD testing.

Dosing chlorine correctly is a key factor in water treatment in pools. Let’s have a look at the world’s most common method.

The DPD testing is one of the most common methods for measuring chlorine levels. The acronym DPD stands for N,N-diethyl-p-phenylenediamine. This method was first introduced by Dr. Palin, a German chemist, in 1957. It’s a simple procedure where we measure the colour depth of the reaction between the chlorine and the DPD reagent.

The use of chlorine in swimming pool disinfection is very usual and pool keepers need to control it very carefully in order to prevent infections while minimising eye irritation. How to make it possible? By keeping the combined chlorine residual as low as possible. No clue what I am talking about? Let’s take it step by step.

First of all, there are different types of chlorine present in pools. Swimming pool water generally contains three types of chlorine known as free chlorine, combined chlorine and total chlorine. You get the total chlorine by adding the free chlorine to the combined chlorine.

    • Free chlorine is the chlorine that is still available to disinfect your pool water.

    • Combined chlorine is the chlorine that has already been used to disinfect the water. It is thus combined with organic matter and responsible for the annoying smell of chlorine.

    • The total chlorine is the sum of the two.

Once the free chlorine has joined with microorganisms, its ability to disinfect decreases. Actually 25 parts of Combined Chlorine are needed to do the sanitising work of one part of Free Chlorine. The Total Chlorine level must be higher than the Free Chlorine level.

With the help of a DPD test kit in the form of tablets or drops, you can measure the pH, free chlorine and total chlorine levels by comparing the resulting pink colour with a colour scale.

Is the DPD method an effective way of controlling the water quality?

The DPD testing is indeed an effective method in order to measure the chlorine level in our pool. The only problem is that DPD not only reacts with chlorine but also with other oxidizing agents such as bromine, iodine or ozone. Its levels in private pools are though almost non-significant.

There are a few issues that you could come up with when reading the chlorine levels:

    • Unclear water can result in a darker colour

    • A dirty cuvette

    • A wrong calibration of the photometer

    • Expired test reagent

In order to avoid misleading measurements, it is important to get a large enough sample. We recommend to take at least 5 different samples, reject the highest and the lowest one and calculate the median of the 3 remaining values.

Follow these simple steps in order to keep your pool disinfection under control and enjoy your bathing season without eye irritation.

RENOLIT ALKORPLAN XTREME Blue Fresh

RENOLIT ALKORPLAN XTREME Blue Fresh

RENOLIT ALKORPLAN XTREME Blue Fresh

Nothing is more resistant!

 

Our partner CLEVER PISCINE from Guanzate in the province of Como in Lombardy presents us this beautiful pool. A pool renovation in the sports centre Bluetime Nuoto; a pool of 20m x 8m x 1,35m where RENOLIT ALKORPLAN XTREME Blue Fresh has been installed.

In the middle of the green park of La Lura this public swimming pool hosts all sorts of courses: aqua gag (soft gymnastic exercises), aqua gym and aqua cycling, among others. That is why the reinforced liner XTREME Blue Fresh was suggested and chosen for this specific renovation project.  RENOLIT ALKORPLAN XTREME was the first chlorine-resistant reinforced membrane launched on the market, resistant even under extreme conditions. 

The colour of RENOLIT ALKORPLAN XTREME Blue Fresh makes the surrounding area of the pool and the other structural elements stand up. RENOLIT ALKORPLAN XTREME is suitable for indoor pools with high temperatures and a high number of bathers, for public swimming pools, for pools where aggressive chemical products are being used and also for pool renovations because of stains or discoloration. Nothing is more resistant than RENOLIT ALKORPLAN XTREME; available in 7 different colours.

What’s more, don’t think of RENOLIT ALKORPLAN XTREME as a reinforced pool liner only for public swimming pools. It’s also foreseen to be used in private pools since it’s ideal for anyone who wants to enjoy their pool rather than worry about its maintenance.

Are you proud of your swimming pool and you would like to show it to the rest of the world? Are you a pool builder with amazing projects made with RENOLIT ALKORPLAN reinforced pool liner? Then please contact us. We look forward to receiving your pictures!

Pool chemical dosage advice

Pool chemical dosage advice

Pool chemical dosage advice

Today we will talk about water treatment and how to dose chemical products into the pool… We are sure that now your swimming looks fantastic and will continue to do so for many years if you follow these simple maintenance instructions regarding the chemicals.

It’s essential activate the circulation pump during the sanitization (it must always be in operation to prevent concentrations from building up in a specific area).

Dilute the chemicals in water and pour the mixture evenly into the different areas of the pool. Some tips:

Do not use floating dispensers as they remain in the same position for too long and could whiten the liner.

Do not use chemicals that contain copper.

 

 

Activate the circulation pump (it must always be in operation to prevent concentrations from building up in a specific area). – Dilute the chemicals in water and pour the mixture evenly into the different areas of the pool. Some tips:

Do not use floating dispensers as they remain in the same position for too long and could whiten the liner.

Do not use chemicals that contain copper.

  • Always read the label with the composition of the chemicals used, especially in the case of algicides.

pool liner; designs; pool; liners; skimmer; slide; pool supplies; reinforced membrane

  • It is best to avoid alqicides whose composition contains copper sulphate.

pool liner; designs; pool; liners; skimmer; slide; pool supplies; reinforced membrane

 

pool liner; designs; pool; liners; skimmer; slide; pool supplies; reinforced membrane

 

 

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      Contact Form

      **alkorplan.info informs you that the personal data you provide by filling in this form will be processed by RENOLIT IBERICA, S.A. as the party responsible for this website.

      Purpose: To manage the request made in this contact form.




      Additional information: In the RENOLIT IBÉRICA Privacy Policy you will find additional information on the collection and use of your personal information by RENOLIT IBÉRICA, including information on access, conservation, rectification, elimination, security and other issues.

       

       

       

       

       

       

      Carry out a daily test to ensure the chlorine level is 1ppm and that the pH is between 7.0-7.6.

       

      If you disinfect your swimming pool with chlorine or with a salt electrolysis machine it is essential than the level of the chlorine is 1ppm and the pH level is between 7.0 and 7.6.
      If you disinfect with bromide the level should be 1ppm and the pH level between 7 and 8. Excessive use of bromide can cause the liner to become brown in colour.

      It is very important that the chemicals do not come int contact with the liner.

      The correct way and safest way to dose chemicals into the pool water is to place the chlorine tablets into the skimmer with the pump in operation. If the product are in the form of powder, granules or liquid and you intend to add them directly to the pool.