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7. Ten top pondwater testing tips

  • Check availability of refill reagents before buying a kit.
  • Always look at the colour strips to see if you can distinguish between the colours or shades. If you're colour blind ask someone else to test for you, or use a digital kit.
  • Rinse out the testing tube in pond water before filling it with water to test.
  • Match the colour of the tested water to the colour chart by holding the test tube in front of some white card alongside the colour strip, with the light source from the side.
  • Match colours in daylight.
  • Always rinse out test tubes immediately after use, and leave them to drain.
  • Keep a record of the date, time and result of each test.
  • Test pH at different times during the day and night to check that fluctuations are not too extreme for Koi to cope with. Generally the acceptable range is 7-9.
  • Some dangerous conditions can develop very quickly. Check frequently for ammonia and nitrite, which are toxic at very low levels. The toxicity level of ammonia depends on the pH and water temperature, so test for all of these at the same time.
  • If you break the tubes or they discolour, don't panic. It's possible to buy spares.

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