Jump to content

API's KH test kit - anyone know how to quantify "bright yellow?"


Emika_B
 Share

Recommended Posts

Aloha!

If you've been following my 40 gallon journal, you'll know I'm having issues with KH.  I started off using Tetra's Easy Strips and have always gotten a result of 0 KH, 300 GH and pH of 7.2.  That's been steady for a week now.  I picked up some API test strips (bad reviews, I know) just to compare, and got the same results.  Huh.  Today I picked up API's liquid test for KH.  Followed the instructions to add 1 drop to 5 ml tube of tank water, cap and invert several times.  That gave me blue water -  yay!  Added 1 drop, capped and inverted and it turned yellow.  Step 4 says, "The test is completed when the water in the test tube, after having been shaken, turns from blue to yellow."  Okay, so 2 drops for my test.  Then, step 5 says, "The KH value is determined by the number of drops of test solution that mus be added to turn the water in the test tube bright yellow."  Okay, keep adding drops.  I stopped at 8 - it was getting darker, not brighter.  What does "bright yellow" mean?  Banana yellow?  Box label yellow?  Wish they'd included a color chart.  2 drops is 35.8 ppm, 8 drops is 143.2 ppm, so very different.

Anyway, I'm going to go with 35.8 ppm since that's close enough to what 2 other tests have told me.  Time to modify one of my fluidized filters and add a media bag of aragonite to it.  Let's see what that does.

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share

×
×
  • Create New...