Water treatment system

The heart of the filtration system consists of the filter that makes it possible to retain all of the impurities sucked in by the skimmers and bottom drain so as to always put transparent water back into the pool.

  • Sand Filter
  • Chlorination treatment


The filter casing is made of polyester resin reinforced with fibreglass, and the ABS cover with gauge makes gaining access to the inside of the filter easy. The cover is secured with stainless steel nuts and bolts.

As the detected pressure rises, the gauge installed on the filter cover will indicate the cleaning conditions of the filter bed with quartz sand having a granulometry of between 0.4 and 0.8 mm.
When the detected pressure goes past that recorded with the clean filter by about ½ atmosphere, it is necessary to wash the filter bed.
We very simply use the multi-way valve on the front of the filter for this operation and for all the others that have to be performed on the filter.
This multi-way valve, otherwise called six-way valve owing to the number of positions it can take on, allows it to go from one position to another by exercising minimum pressure on the handle and making it turn clockwise until the index stops in the desired position.


Checking the chlorine and pH in any pool takes on a fundamental importance both in the public and private spheres.
For public pools, in addition to checking it manually it is advisable to use electronic equipment that continuously checks both the pH and chlorine values and that automatically proportions the chemical products.

The chlorine put into the pool is used to oxidise the contaminant substances in the water, substances brought in by the bathers (perspiration, urine, saliva, etc.), and to eliminate the chlorine resistance of algae, bacteria, etc.
Depending on its degree of contamination, all water has its own “chlorine demand” necessary for oxidising its contaminants. If insufficient, oxidation creates products (chloramines) that are responsible for the annoying chlorine odour and eye irritation.

When all of the contaminant products have been oxidised (i.e. the break-point has been passed), the chlorine still available remains as free chlorine that “guards” against any other contaminants that should turn up. By keeping a free chlorine rate in the water ranging between 0.7 and 1.5 ppm, you will have water with the maximum guarantee of hygiene.

The purpose of superchlorination is to keep the chlorine in the water above the break-point, thus also assuring that the irritating products (chloramines) are complete oxidised.


It is advisable to keep the pH value between 7.0 and 7.4.
The pH almost always tends to increase over time.
If the pH is greater than 7.5, the water is basic, so it fosters the development of bacterial flora and algae, and lime deposits and tends to stay turbid. This value has to be reduced with the use of a pH reducer (10 g/cubic m of product reduce the pH by 0.1 units on the average).
If the pH has a value less than 7.0, the water is acidic. This value has to be increased with the use of a pH increaser (10 g/cubic m of product increase the pH by 0.1 units on the average).