how to find out if api test kit is expired

Discussion in 'Aquarium Water' started by redlessi, Dec 14, 2009.

  1. redlessiWell Known MemberMember

    help, just want to make sure my test kit is not expired. thanks much

    testing results in high nitrates 40, just did water change yesterday.
  2. ShawnieFishlore LegendMember

    check the lot #s on each bottle..its suppose to have a shelf life of 3 years from those dates..the last 4 digits are the year and month they were made
  3. redlessiWell Known MemberMember

    thanks much, now the question of why high nitrates the day after water change. its usually 20 and I do water changes every week.
  4. ShawnieFishlore LegendMember

    could you have not shook the number 2 bottle hard enough? that is really weird...test your tap water ...maybe with the change of seasons, theres something in the water source\?

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