4 ms·
Speaking of sanitising bleach, does it have a best-before date? I have a bottle of it sitting around, but it’s quite old and I’m not sure if the date on it is
by Filligree 3y ago
Speaking of sanitising bleach, does it have a best-before date?
I have a bottle of it sitting around, but it’s quite old and I’m not sure if the date on it is when it was made or when it should be discarded.
- amluto 3y agoProbably discard it. Hypochlorite is unstable, and it loses potency. Or, if you’re feeling adventurous, dilute it 1:20000 or so and measure it with a pool test kit. Also, one of the degradation products is chlorite, which is somewhat nasty. You can find actual research from the swimming pool chemical industry. At higher concentrations (bleach sold for swimming pools is more concentrated), it’s less stable and apparently should ideally be used within 30 days in hot weather. The household stuff ought (good luck!) to be more stable, and you’re probably not storing it in a hot pool equipment room.
- dist-epoch 3y agoEven if concentrated (5%+), it will expire after about 1 year. If it's diluted for use, it will expire in a few months.
- neilv 3y agoThe brand might document. For example: https://www.clorox.com/learn/how-to-tell-when-a-bleach-bottle-was-made/ https://www.clorox.com/learn/how-to-tell-when-a-bleach-bottl...