Hanna alkalinity checker
- Thread starter Tuskgarry
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X-37B
Fight The Good Fight
I never shake it and have tested alk every morning for the last 1.5 years.
I have never had an issue of it being that far off.
I have heard of bad batches from others but maybe im just lucky.
Always have a second way to verify. I use salifert and elos.
I have had a few readings that were off quite a bit but is was always my fault and not the unit.
Bottle to bottle has been within .3 for me but usually lower.
My alk range is 7-7.5 so if its off a few tenths its not a big deal.
At least it hasnt been since startup.
Salifert as backup as it is always within .2 of hanna.
I have never had an issue of it being that far off.
I have heard of bad batches from others but maybe im just lucky.
Always have a second way to verify. I use salifert and elos.
I have had a few readings that were off quite a bit but is was always my fault and not the unit.
Bottle to bottle has been within .3 for me but usually lower.
My alk range is 7-7.5 so if its off a few tenths its not a big deal.
At least it hasnt been since startup.
Salifert as backup as it is always within .2 of hanna.
Last edited:
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SliceGolfer
Valuable Member
Here’s some tips:
1. Always use a 10ml syringe to fill the cuvette as the printed line is suspect.
2. Always try to purchase reagents from the same production lot, meaning buy two or three refills at a time if possible.
3. Before your reagent bottle is completely empty, perform a test and then open a new reagent. Repeat test with new reagent. Note the variance and write it on the new reagent bottle. Add or subtract this variance forward and repeat this for each new bottle of reagent you purchase.
4. Don‘t chase Alk based on the number returned by the test kit. Get a baseline Alk reading by using multiple test kits, and using the method above, maintain Alk by that reading.
5. Always wipe the cuvette during C1 and C2 to remove fingerprints.
6. Store the cuvette filled with Rodi water to prevent spots.
7. Place scotch tape over the printing on your syringes so the numbers don’t wear off due to handling.
These steps should help prevent swings and improve test accuracy.
1. Always use a 10ml syringe to fill the cuvette as the printed line is suspect.
2. Always try to purchase reagents from the same production lot, meaning buy two or three refills at a time if possible.
3. Before your reagent bottle is completely empty, perform a test and then open a new reagent. Repeat test with new reagent. Note the variance and write it on the new reagent bottle. Add or subtract this variance forward and repeat this for each new bottle of reagent you purchase.
4. Don‘t chase Alk based on the number returned by the test kit. Get a baseline Alk reading by using multiple test kits, and using the method above, maintain Alk by that reading.
5. Always wipe the cuvette during C1 and C2 to remove fingerprints.
6. Store the cuvette filled with Rodi water to prevent spots.
7. Place scotch tape over the printing on your syringes so the numbers don’t wear off due to handling.
These steps should help prevent swings and improve test accuracy.
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Lightspeed
Active Member
i was told by an aquarium service person when i bought a full suite of Checkers that Hanna Alk and Cal always shoot high, i did not really pay attention as i guess everyone has their own opinion and for me Hanna is more reliable than comparing a colour chart.
So i bought the reference solutions for DKH and Cal and both of my Hanna's read bang on within their correction parameters.
I have been through several batches of reagents so far but both show no abnormal variation outside of their - + parameters.
Clean your vials inside and out with Hanna solution now and then, i also clean vials every now and then with dilute Nitric Acid, rinse well with 0 tds before and after your test, always wipe with Hanna vial cleaner and glass cloth before C1 and after C2 reagent addition, place the vial in the same position on C1 and C2 tests, always measure your 10 ml to the bottom of the meniscus curve and draw your reagent in a smooth consistent motion to the 1ml mark.
The more effort you make in cleanliness and accuracy, the more repeatable and consistent your test results will be
So i bought the reference solutions for DKH and Cal and both of my Hanna's read bang on within their correction parameters.
I have been through several batches of reagents so far but both show no abnormal variation outside of their - + parameters.
Clean your vials inside and out with Hanna solution now and then, i also clean vials every now and then with dilute Nitric Acid, rinse well with 0 tds before and after your test, always wipe with Hanna vial cleaner and glass cloth before C1 and after C2 reagent addition, place the vial in the same position on C1 and C2 tests, always measure your 10 ml to the bottom of the meniscus curve and draw your reagent in a smooth consistent motion to the 1ml mark.
The more effort you make in cleanliness and accuracy, the more repeatable and consistent your test results will be
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