In Reply to: re: Castlebar Water posted by Jackobite on March 12, 2015 at 13:59:17:
The 'effect it has' What precisely is it - that makes us docile troll? What a load of crap!
Chlorine and UV are used to disinfect drinking water. Deep sand filtration is also useful. Aluminium or iron compounds are used to remove particulates and improve the colour.
Unfortunately Cryptosporidium is not killed by chlorine.
Many of the smaller and older less high tech systems do not have UV or deep sand filters to eliminate Crytosporidium. Parts of County Roscommon being a case in point at the moment. Boil notices are needed there as a result of lack of investment in the water system.
If coliforms are found at the tap then that means that the chlorination/disinfection is insufficient. This generally only occurs in small group water schemes nowadays but occasionally even the big plants will suffer problems.
Other issues are pipe breaks where contamination occurs after the treatment.
Over-chlorination of water that has high colour can give rise to THMs - which don't make you docile but are carcinogenic.
The balance between killing you quickly with VTEK - a particularly nasty E. coli infection that you really don't want to contract and keeping the byproducts of chlorination below the legal limit is a technical task that requires knowledge, training and good equipment.
This doesn't come for nothing.
Castlebar has a very good water supply and we are lucky in that - the past THM issues are behind us more or less. Boil notices are not something we see here - unless a pipe break caused by an accident of some sort causes contaimination.
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