for dechlorization as my lfs says no chemicals.
my friends says she used to leave her new tap water sit over night before adding it to get rid of chemicals.
she says she doent baby her fish that way they wont die when other people dont baby them.
Shane wrote:my friends says she used to leave her new tap water sit over night before adding it to get rid of chemicals.
That only works if the water is aerated and the chemical used to treat it by your municipal supplier chloramine. It takes circa 12 days to drive chlorine from water via aertion.
NH2Cl is commonly used in low concentrations as a secondary disinfectant in municipal water distribution systems as an alternative to chlorination. This application is increasing. Chlorine (sometimes referred to as free chlorine) is being displaced by chloramine, which is much more stable and does not dissipate from the water before it reaches consumers.
Removing chloramine from water
Chloramine can be removed from tap water by treatment with superchlorination (10 ppm or more of free chlorine, such as from a dose of sodium hypochlorite bleach or pool sanitizer) while maintaining a pH of about 7 (such as from a dose of hydrochloric acid). Hypochlorous acid from the free chlorine strips the ammonia from the chloramine, and the ammonia outgasses from the surface of the bulk water. This process takes about 24 hours for normal tap water concentrations of a few ppm of chloramine. Residual free chlorine can then be removed by exposure to bright sunlight for about 4 hours.
Boiling the water for 20 minutes will remove chloramine and ammonia.
I'm pretty certain this is back to front with regards to chlorine vs. chloramine. The reason water companies use chloramine is that it's MORE stable and don't "evaporate". Chlorine gas added to water "evaporates" (or rather equalises with the surrounding air).
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