Some effective solutions
Hypochlorous acid
The hypochlorous acid contained in WL-ASETTIx,
chemical formula HClO, owes its disinfectant capa-
bilities to the presence of a chlorine atom with oxi-
dation number +1, which makes it highly oxidizing.
The product can be atomized to saturation for a tre-
atment of the air and the hardly reachable surfaces.
For these activities it is possible to dilute it up to 150
mg/L of active chlorine (dilution 30% with preferably
demineralized, osmotized or distilled water) and ato-
mize it. Once sanitizing is carried out, it is necessary
to let the fog remain in suspension inside the closed
environment and empty at least 15 minutes (time
considered sufficient for the action of disinfectan-
ts/sanitizers) before removing any excess product
with a clean cloth, without rinsing. For use in hygie-
nic tunnels aimed at sanitizing goods, equipments
and persons, it is possible to dilute the product up to
150 mg/L of active chlorine (dilution 30% with water
preferably demineralized, osmotized or dermatolo-
gically on sensitive skin, oral mucosa, corneal cells,
nasal epithelium and alveolar cells. Active chlorine
released from hypochlorous acid is not listed in any
group of substances monitored and no specific oc-
cupational exposure limits have been identified. In
the context of water treatment, for the dosage of the
product at the injection point, the spontaneous loss
of active chlorine and that resulting from the concen-
tration in water of the species from oxidize: organic
substances, microorganisms, ferrous and manga-
nese ions and other components. For this reason,
the dosage of the product at the injection point is on
average 0.1% corresponding to 1 ml of pro-duct per
litre of treated water (approximately 0.3 ppm). The
residual concentration of the product can be identi-
fied by a common test for the cleaner nation of free
chlorine.
In the case of shock sanitation, the product is fed into
water until the concentration of residual free chlori-
ne of 20-50 mg/l is reached throughout the plant,
including distal points. After a period of contact of 2
hours, with 20 mg/l of active chlorine, or 1 hour, with
50 mg/l of active chlorine, allow the water to flow into
the plant until the level of chlorine does not return
within the concentration limits established by current
regulations (0.2 ppm). In this period of time, it is ab-
solutely necessary to avoid the use of the utilities
involved in shock sanitation (it is appropriate to affix
special signs).
Chlorine dioxide
The stabilized solutions of Chlorine Dioxide WL-SA-
NIFAST are a powerful and effective broad spectrum
bactericidal, virucidal and fungicidal oxidizing agent
able to neutralize also sulphates and other harmful
or toxic substances. WL-SANIFAST is a stable pro-
duct, safe when used in compliance with the acti-
vation and the instructions for use, and it is a very
effective alternative to chlorine or hypochlorite, as
it does not has the disadvantages entailed by the
latter. Unlike the latter, this product does not release
bad odours, has an excellent residual activity and,
most of all, does not act by chlorination but by pene-
trating the cell wall of bacteria and eliminating patho-
gens. It’s much more It is much faster than traditional
systems such as glutaraldehyde or quaternary salts,
it is stable in a very wide pH range, and it is also
able to attack and break up the Biofilm; furthermore,
it does not produce known halomethanes, and has
the advantage, unlike chlorine, of not being volatile
at high temperatures. Chlorine Dioxide is interna-
tionally recognized as a water purifying agent and
therefore able to neutralize also the Vibrio Cholerae
(cholera) in addition to many microorganisms. The
concentrations to use vary depending on the type of
disinfection to be carried out and on the degree of
contamination of the water (see the table in Fig. 1).
main microorganisms
Aspergillus fumigatus
escherichia coli
Pseudomonas aeruginosa
Salmonella Tiphimurium
Staphylococcus aureus
Canine parvovirus
Fig. 1 – Report on the antimicrobial efficacy of chlorine dioxide
TANK
ACCUMULATION
Indicative scheme for the
anti-legionella protection
60 seconds
30 seconds
10 minutes
60 seconds
60 seconds
10 minutes
CONSUMPTION
RECYCLING
COLD WATER
Bacillus cereus (spore)
Concentration ppm
(parts per million) or mg/l
200
200
100
25
Contact time
5 minutes
60 seconds
71
Legionella pneumophila
Candida albicans
Streptococco faccium
Salmonella choleraesius
Proteus vulgaris
500
100
100
100
93
500
500
100
60 seconds
60 seconds
10 minutes
60 seconds
