Water testing

Most liquid test kits are fine. Just check the expiry date on them and avoid buying kits that have been kept in warm, humid or brightly lit areas because heat light and humidity cause the reagents to break down faster.

Don't bother getting a GH or KH test kit unless you have money to burn. The GH and KH don't change much over the year and you can usually find them on your water company's website or by phoning them. You can also take a glass full of tap water to a pet shop and have them test it for you a couple of times a year.
 
Most of us use the API Master kit:

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