GH and KH

Discussion in 'Test Kits' started by DebsR, Jun 30, 2016.

  1. DebsRValued MemberMember

    Hi all,
    Could anyone help with the reading on API GH & KH tests, the instructions aren't very clear. It took 2 drops to turn KH yellow and 4 drops to turn GH green. Am i right in reading that as 0-50ppm KH and 50-100ppm GH?

    It certainly made me sure in my decision to buy RO water from my lfs it took 15 drops to turn the tap water sample green!! That isnt even on the scale!

    Many thanks
  2. CoradeeModeratorModerator Member

    Bumping this up for you
  3. CindiLFishlore LegendMember

    Hi, sorry for the late response.

    Two drops for your KH would be 35.8 which is too low. 4 drops for your GH would be 71.6 which depending on your fish would be ok. What kind of fish are you keeping?

    The low KH can lead to a ph crash. I'd recommend actually doing 50/50 RO and tap water and test that and see what your GH and KH are then. Your fish need minerals but over 250ppm is high. You just multiply 17.9 x how many drops you had to use for the actual ppm.
  4. DebsRValued MemberMember

    Thank you :) see information like that in the instructions would be great!! I am currently keeping zebra danios, neon tetra, dwarf gourami, clown pleco and amano shrimp. I will do a test of RO/Tap tomorrow and see what i get. What Kh should i be aiming for?

    Thanks again for the response
  5. CindiLFishlore LegendMember

    I would aim for 5 drops or more for KH to keep your ph stable.

    There should be an insert with a chart if it's the API kit that shows the drops, and the equivalent ppm and degrees. Otherwise 17.9 is the magic multiplier for both tests.
  6. DebsRValued MemberMember

    Amazing :) thank you so much

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