Excellent GH Test Kit

[gwand]

When I needed to test water GH I used the API test kit. I found it cumbersome because after each drop of solution you needed to cap the test tube and give it to shake. The German company, Sera makes a GH test kit with a very wide test tube. After each drop of solution into the test tube, you do not need to cap it, you just give it a few flicks with the finger to disperse and thoroughly mix the reagent with your water. Very easy.

 

[MaloK]

If both use 5ml of water for a test, you can also use the API reagent with these tubes.

 

[gwand]

Yes indeed.

 

[AJ356]

I like the API one, very reliable as I have tanks with both tap water and RO water. I test GH all the time, mutliple tanks with different mixes of tap water/RO.

You don't need to stand there and enter 1 drop at a time. My tap water is fairly hard and goes from orange to green at either 15 or 16 drops. It doesn't matter if I do one drop at a time or 6 drops at a time.

If this makes sense, what I am saying. If I know my water is going to take at least 12 drops to go from orange to green I won't do 1 drop at a time until I get to 12. I'll do something like 5 drops then shake the vial, another 5 drops and shake, and THEN I will go to 1 drop at a time. I've experimented loads. Putting multiple drops in and then shaking does not change the result.

Not sure if this will make sense when you read it?

 

[Essjay]

I know exactly what you mean - that's how we did titrations many many years ago for A level chemistry practical exam. A trial titration first by adding several mls a time, which meant we knew how much was not quite the end point and how much was past the end point, then the actual titrations by adding reagent to the 'not quite enough' amount, then drop by drop to find the end point amount accurately.

 

[gwand]

I know exactly what you mean - that's how we did titrations many many years ago for A level chemistry practical exam. A trial titration first by adding several mls a time, which meant we knew how much was not quite the end point and how much was past the end point, then the actual titrations by adding reagent to the 'not quite enough' amount, then drop by drop to find the end point amount accurately.

Yes. Makes perfect sense. Thanks.