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I'm using the Aquarium Co-op Test strips and it gave me this light pinkish purple color for the gh.  I'm not sure if that means it's high or what. I tested it twice and followed the directions by swirling it in the tank for 3 seconds and then waited 1 minute before reading it. 

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Posted (edited)

I've never seen that result before when using Aquarium Co-Op test strips.  Interesting... 😵‍💫

However, I do get a purple GH color that I'm unable to interpret:

 

test1.jpg

Actually, now that I look at it through a picture, it seems somewhat close to what you are seeing...

Edited by Galabar
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It looks like 80-90 to me.

I would recommend trying to have a GH/KH test kit (API liquid) on hand. It's not the most fun thing in the world, but it does make it nice when you run into issues.  If you keep any invertebrates it's a very invaluable tool!

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Posted (edited)
On 7/4/2023 at 10:24 PM, Galabar said:

Any idea why it's light purple?

One of the pads has some contamination.  The light purple = off the scale to the right.

Demonstrated / explained in this video.
 

 

Edited by nabokovfan87
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The video was very informative! Thank you!

However, I'm still getting the same results after trying the towel method. It doesn't look like there's bleeding from anything onto the hardness/GH pad, and I've tried two more times in the same tank and one in another tank with the same results. This weird light purple pink color. Definitely not a blue or true purple to really be able to tell what it is.  I havent had this issue before with these strips.  I believe they are the ones with the nitrate pad coming off, that samw batch, but i havent had any issues with that.  

I do have an API liquid test kit I can dust off. I hope it's not expired 😕 

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On 7/4/2023 at 6:42 PM, Galabar said:

I've never seen that result before when using Aquarium Co-Op test strips.  Interesting... 😵‍💫

However, I do get a purple GH color that I'm unable to interpret:

 

test1.jpg

Actually, now that I look at it through a picture, it seems somewhat close to what you are seeing...

Those are the same colors I get each time I test.  I have also considered it to be off the scale to the right.  My local waterworks says I'm wrong, a chemist said I'm right.  Hopefully Amazon will deliver the GH-KH test kit tomorrow and we will see.

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On 7/7/2023 at 1:36 PM, Galabar said:

Should we assume that anything purple (even light purple) is on the right side of that scale (or over)?

Yes And no.

What we should do is verify things with a secondary test kit. I.e. liquid.

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