4th stage: Filtration (15.40 minute)
The water now needs filtration to get rid of any remaining particles. Water is filtered slowly
through very fine sand or sandlike material. Filtration is simply the passing of water
through a permeable fabric or a bed of porous material such as sand that collects the
suspended solids from an incoming flow. Some systems may use direct filtration; this is
possible when the raw water is of good quality having low turbidity and few contaminants
even during storm events. When the water is of good quality, direct filtration and
disinfection may be the only treatment required for safe drinking water. As the filters
become clogged, they must be cleaned. This is accomplished through backwashing.
Backwashing is reversing the flow and increasing the speed in which the water passes back
through the filter. This blasts the clogged particles off and over the filter.
5th Stage: Disinfection (16.51 minute)
For some river waters we use ozone gas injection as a treatment stage. This can work in
conjunction with GAC (granular activated carbon) treatment, where the water is filtered
through carbon granules to take out any undesirable traces of large natural organic
materials. The carbon in these filters is removed and regenerated by heat, so it can be
used again. Now the water is filtered and thoroughly cleaned, it is disinfected to make sure
no harmful bacteria remain. A small controlled amount of chlorine is the most effective
method and provides essential customer protection. This method is used across most of
the world. The chlorine has to stay in contact with the water for a period of time for
effective disinfection. Last but not least adjustments are made to the pH levels of the
water during the treatment process, so that it is neither too acid nor alkaline. This helps
pipework fittings and the water itself. From the treatment works water is fed into a huge
mains pipe network, which forms a grid around the region. This grid is then accessed
directly through your home and when you turn the tap on, it’s available to you; clean, safe,
drinking water.
4th stage: Filtration (15.40 minute)The water now needs filtration to get rid of any remaining particles. Water is filtered slowlythrough very fine sand or sandlike material. Filtration is simply the passing of waterthrough a permeable fabric or a bed of porous material such as sand that collects thesuspended solids from an incoming flow. Some systems may use direct filtration; this ispossible when the raw water is of good quality having low turbidity and few contaminantseven during storm events. When the water is of good quality, direct filtration anddisinfection may be the only treatment required for safe drinking water. As the filtersbecome clogged, they must be cleaned. This is accomplished through backwashing.Backwashing is reversing the flow and increasing the speed in which the water passes backthrough the filter. This blasts the clogged particles off and over the filter.5th Stage: Disinfection (16.51 minute)For some river waters we use ozone gas injection as a treatment stage. This can work inconjunction with GAC (granular activated carbon) treatment, where the water is filteredthrough carbon granules to take out any undesirable traces of large natural organicmaterials. The carbon in these filters is removed and regenerated by heat, so it can beused again. Now the water is filtered and thoroughly cleaned, it is disinfected to make sureno harmful bacteria remain. A small controlled amount of chlorine is the most effectivemethod and provides essential customer protection. This method is used across most ofthe world. The chlorine has to stay in contact with the water for a period of time foreffective disinfection. Last but not least adjustments are made to the pH levels of thewater during the treatment process, so that it is neither too acid nor alkaline. This helpspipework fittings and the water itself. From the treatment works water is fed into a hugemains pipe network, which forms a grid around the region. This grid is then accesseddirectly through your home and when you turn the tap on, it’s available to you; clean, safe,drinking water.
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