A collegue at work has just told me that if you put fresh tapwater into a bucket and leave an airstone going in it overnight, the next day the PH will have lowered as contaminates will have been 'boiled' out. Is this right?
Tap water contains dissolved gasses and temporary buffers to ensure that it's close to a nice tasty PH 7 for us humans to drink when we put it into a glass. If you leave the water standing these temporary buffers degrade, disperse or otherwise leave the water and the ph returns to its more natural and stable PH.
This could mean the PH goes up or down, it depends on the chemical composition of the water.
Ah, that's interesting, so the water in the tank will be a different PH to that coming out of the tap then, on the basis that over time, the buffers will also evaporate and the tank will return to it's true PH?
Yup, Eagle is right. No airstones needed and these don't "boil" the water. All freshly drawn water settles to it's true pH after 24 hours anyway. Just leave a cup standing and test after a day.
My tap pH is around 7.4 but falls to 6 quite rapidly so I have to buffer the tank up with coral shell, others have tap water around 7 but this goes up to 8 or more after a day. Local water companies do a bit of dabbling with dissolved gases and other additives etc to ensure it's nice for us to drink and that any lead in old pipes doesn't get dissolved too rapidly!
Most tank filtering processes, acidify water to a degree, more noticeable in soft water areas. Tank pH is therefore sometimes quite different to tap pH if tested immediately
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