Potassium/Sodium Metabisulphite.

[Greg2013]

I wanted to brew up my stout kit this weekend but i forgot to order campden tablets with my last order.Do any of the chemist shops stock this stuff for sale to the public ? The water in this new place stinks of chlorine,i could just get bottled water i suppose for this brew but if the campden was available more locally would be good.

[Leann ull]

Boil it and let it cool

[DEMPSEY]

With the lid off

[Greg2013]

With the lid off

[wallacebiy]

I've an awful suspicion that I'm sensitive/allergic to Sodium Metabisulphite . so I've never used campden tablets .

If there's a lot of chlorine smell in your new place it could just be because the taps have been idle for a while (chlorine will build up as it tries to escape the water ) .
or a temporary upping of the dose ( councils sometimes do that at particular times of the year )

Chlorine isn't very stable in water so boiling or vigorous spraying should allow it to vacate the water .

Put a hose on the tap and use the fine mist to fill your fermenter maybe leave it for a few hours to blow off before doing your kit .

[Greg2013]

I've an awful suspicion that I'm sensitive/allergic to Sodium Metabisulphite . so I've never used campden tablets .

If there's a lot of chlorine smell in your new place it could just be because the taps have been idle for a while (chlorine will build up as it tries to escape the water ) .
or a temporary upping of the dose ( councils sometimes do that at particular times of the year )

Chlorine isn't very stable in water so boiling or vigorous spraying should allow it to vacate the water .

Put a hose on the tap and use the fine mist to fill your fermenter maybe leave it for a few hours to blow off before doing your kit .

In the end i boiled enough water to do three brews and left it until following day to use.I will have to get some campden though as i am here three weeks now an the chlorine is persistingly bad,boiling each time is costing a fortune in electric.

[Will_D]

Just to be clear:

Main stream water companys do not use free Chlorine gas as a water treatment.

They use Chloramine ( a compound of Chlorine and ammonia) it has the same effect!

That is why our GB water tests showed in the most part "Free Chlorine;  0.0" when every one could smell it in the tap water.

[delzep]

So no point in leaving water out overnight?

[SkiBeagle]

No. And boiling won't clear it either, unless you boil for quite a long time. Sodium metabisulfite is the fast answer. Takes only seconds. And you can trim the dose for no residual NaMeta.
http://www.homebrewtalk.com/showthread.php?t=361073

[Sorcerers Apprentice]

The tap water around blanchardstown is dreadful for chlorine. At times you can smell it while the tap is running. However if it's left overnight it seems to dissipate, also the water from the storage tank in the attic ie bathroom tap water doesn't smell of chlorine.
I checked with Eddie Burke who gave the presentation on water at the first Brecon and here's his reply

Chlorine is added to disinfect but when it combines with any organic material to oxidise it chloramines (a whole category of compounds) form.  The best known of these is chloroform

that is why water is pretreated by flocculation and sand filtration before chlorination. the two initial processes remove as much as possible before a small dose of chlorine is added for disinfection at the waterworks but also to keep it clean through the pipework especially if leaks are suspected.

i have found the water in the city centre horribly chlorinous in recent years and at weekends you can smell chlorine from blanchardstown tap water.   They reduce pressure and increase chlorine at night and weekends.  There is a limit on chloramines

[Will_D]

Chlorine is added to disinfect but when it combines with any organic material to oxidise it chloramines (a whole category of compounds) form.  The best known of these is chloroform

Sorry but Chloroform (tri-chloro methane) does not contain a NH2 group so cannot be considered a chloramine.

I also believe that no chlorine gas is used in modern water treatment facilities.

[Sorcerers Apprentice]

It's says here it's treated with Chlorine and that it dissipates overnight
http://www.dublincity.ie/main-menu-services-water-waste-and-environment-your-drinking-water/frequently-asked-questions

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[Sorcerers Apprentice]

It also states in this document on the NH4 row that Chloramine is not used in Ireland
http://www.dlrcoco.ie/en/water-drainage/water/drinking-water-quality
There seems to be concern among the fish keeping community, that Chloramine is being used here and denied at the same time. My only sense about it is that the Chlorine smell does reduce if the water is left standing overnight, which would seem to tie in with the claims from Irish Water.

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[Leann ull]

I know Roundwood reservoir is on its arse at the moment and speaking to those "downstream" I believe the dose gets higher to ensure no nasties are coming through.