You will find in this section a few questions asked by people
responsable for public or commercial pools, engineers and aquatic
directors. If you have any questions, we would be happy to receive them
and answer. With your permission, we will post them in the section
below. Every question is a good one! 


Our municipal interior pool respects every quality standard set by the gouvernment, why change?

Improving the pool's water quality makes it more comfortable for the bather and is also better for the health. Our experience has shown us that bathers often complain of short breaths, skin and eye irritation, even when swimming in pools that meet regulatory standards. Imagine the comfort when bathing in clean, clear and pure water with very low concentrations of desinfection by-products!

What are trihalomethanes(THM) and why should I be concerned ?

        Trihalomethanes are volatile gases that are part of the by-products of chlorination and can have toxic effects on the human
         body. Studies have already shown the negative effects of THMs on health. Many countries (Germany, Switzerland, Austria,
         etc.) limit the amount of THM in the water for indoor swimming pools. FINA recommends a maximal amount of 20 micrograms
        per liter.

A shock-treatment is done regularly to help maintain the pool's water quality, doesn't that fix the problem?

The fact that you have to shock-treat the pool is in itself an indication that there is a problem with the water quality. Some products used for shock-treatments (monopersulfate) can even cause allergic reactions to bathers. Using our technology eliminates the need to shock-treat (no need to overchlorinate for elimination of chloramines), the water quality is constantly at its best.  Click on the following link to see an interview with Monona Rossol (industrial hygienist, chemist):

Can the procedure of flocculation/coagulation block the filters or create filter channelling?

Flocculation-coagulation done at high filtration speeds usually blocks the filters or creates filter channelling. Aldest inc. uses advanced technologies to avoid those problems while doing the flocculation-coagulation procedure.

When using the flocculation/coagulation procedure, do I have to backwash more often? 

          For a short time after beginning this procedure, it is normal that more backwashes have to be
          done because the filter(s) are now able to retain the impurities that were previously going through.
          After this period, the intervals between the backwashes can be longer than before using the procedure,
          which makes economies in fresh water and energy for heating.

What are some advantages of chlorine dioxide?

          Chlorine dioxide has the advantage of oxidizing impurities without formation of chloramines and can rapidly oxidize
          microorganisms that are resistant to chlorine only. A small concentration of chlorine dioxide (0,1-0,2ppm) reduces the
          formation of chloramines and helps the chlorine disinfect more efficiently.

To optimize filtration by using the flocculation-coagulation procedure, do I have to modify the filtration system?

Only  two small dosing pumps are required to optimize filtration - installation takes usually less than 30 min.

For additional oxidation of my pool water, do I have to modify my filtration system?

 Only one small dosing pump is required.

Does using those technologies recquire changing the filter(s)?

           Absolutely not -  the existing equipment can be used.

How long have those technologies been used?

The technologies used by Aldest inc. were developed in Germany and Austria about 20 years ago.

Meanwhile those technologies and "know-how" are used in more than 40 countries to improve water quality.