Astralpool BILBAO Manuel D'installation Et D'entretien page 3

What is understood by free or residual chlorine?
Even after the filtering process, certain bacteria remains to be destroyed by the disinfecting action of the chlorine which is
usually acting on the bacteria in the form of hyperchloric acid.
A quantity of chlorine that is added to the water (in excess of that needed to destroy bacteria and oxidize organic material)
remains free to combat new bacteria introduced by bathers or atmospheric agents.
This chlorine remaining in the water in the form of hyperchloric acid is known as free, residual chlorine.
FILTRATION
It is essential that the filtration is accompanied by chemical treatment of the pool water.
The two processes are complimentary to each other.
WORKING PRINCIPLES
(6) return suction inlets (2) skimmer
(5) filter
multiport valve
(1) drain
(4) pump (3) valve
A suction is taken from the main drains (1) on the bottom of the pool and the skimmers (2) at the pool surface and fed via
separate pipework with their corresponding valves (3), through the pump (4) to the sand filter (5).
After filtration, the water is returned to the pool via return inlets (6), which are installed on the opposite side of the pool to
the skimmers and main drains.
Once in the filter, the water is circulated downwards through silica sand and suspended particles are retained.
The filter sand needs to be washed at intervals to remove the particles it has retained backwash.
This is achieved by reversing the flow through the filter and directing the water containing the dislodged particles to drain.
2
When the filter pressure increased by 0.5 kg/cm or more with respect to the initial pressure means that the sandfilter needs
to be backwashed.
Bearing these principles in mind, the following installation and operation instructions should not represent any problem.
selector valve
return
suction
waste