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View Full Version : So I got a new Hanna CA Checker...


RussC
05/29/2018, 11:18 AM
When Hanna came out with the new CA checker, I thought I'd give it a shot. I love the ease and simplicity of the Hanna Checkers. And this one is no different. Relatively simple once you get the process. But my readings are consistently high compared to my Red Sea test. Anyone experiencing this?

For example...my most recent test with the Hanna checker was 438. But with the Red Sea it was 400. The day after I did a water change the Hanna registered 459. But the day after water changes the Red Sea registers around 430. There's a consistent average in the difference, but still, I think the Hanna is on the high side. I'm more likely to believe the Red Sea results than the Hanna results.

I don't dose CA at the moment. Not really been necessary. But its next on my list. Just got my ALK dose dialed in. So now I'm focused on CA.

mcgyvr
05/29/2018, 11:31 AM
Hanna Color Checker states a precision as follows (I'm assuming its really accuracy is what they meant)..
Precision: Ī6% of reading
Red sea defines accuracy -/+ 5ppm

Given those numbers both results seem to be "close enough" for test kits like that and between manufacturers..

RussC
05/29/2018, 11:47 AM
Although the Hanna checker is higher than the Red Sea test, the changes in CA have been consistent in both tests. It would be nice to be accurate on the Hanna. I do like those tests. But it could be something as simple is CA in my RODI water throwing off the Hanna. If that's the case, oh well. I'll just have to roll with it.

RussC
05/29/2018, 11:49 AM
How's the baby, Mac?

outssider
05/29/2018, 04:56 PM
when testing with red sea are you ending when the sample turns blue, if so, this would explain the lower reading. You must keep swirling the vial for at least another 20 seconds or so. If the sample is still blue, you've reached the end point. It takes two or three more drops of reagent for the sample to stay blue without reverting back to some shade of purple /blueish color...… when it stays blue, this is the endpoint.

RioReefr
05/29/2018, 05:28 PM
I use the Hanna Checker for Calcium. The problem I have with it is the literally 1-mL sample size. I have done consecutive tests back-to-back with the same water sample and gotten a +/- 30 difference. I use medicallly-sealed injectibale water in the test as well.
My eyesight is near perfect, but I use reading glasses to make sure everything measures to the level-line and use a tiny little syringe needle to get every little purple speck out of the reagent packets. All the vials are washed with vinegar, rinsed in RO/DI water and then thoroughly dried.
But, bottom-line with the super tiny amount of water there is just too much room for error (for a few drops of aquarium water used).

My advice is along as you getting something close to your "expected" result (i.e. 450 or whatever), then that is the best you can hope for. If you measure something like 420 and you think are going to "add so much X" of "this Z" to reach 430, then forget it !! To be perfectly honest, I bet the device has a +/- of 50 (or even more).

Hanna's Alkalinity is great, easy and accurate. But, the Calcium is much to be desired. Personally, I think you are better off with Red Sea.

mcgyvr
05/30/2018, 05:54 AM
How's the baby, Mac?

Doing fantastic thanks for asking...Just hit 5 months old and is almost sleeping through the night.
Started him on some solid foods (bananas/pears/apples puree that we made fresh and put into pouches) and he is starting to roll over/sit up..
The grandparents (my parents) and my sister/her kids were all here this week to visit him so I had a full house all week..
My wifes sister/dad come in another 2 weeks...

Looks like I'll burn through all my vacation with everyone coming for visits so no beach vacation for us this year.. Maybe Christmas time cruise or something..

RussC
05/30/2018, 08:19 AM
when testing with red sea are you ending when the sample turns blue, if so, this would explain the lower reading. You must keep swirling the vial for at least another 20 seconds or so. If the sample is still blue, you've reached the end point. It takes two or three more drops of reagent for the sample to stay blue without reverting back to some shade of purple /blueish color...Ö when it stays blue, this is the endpoint.

You bring up a good point. When using the Red Sea, I give it a good 10 seconds once I see blue before I settle on that reading. If it starts to change, I give it another drop and wait another 10. I haven't given it 20 seconds as you recommended. But I could certainly try.

mcgyvr
05/30/2018, 09:09 AM
You bring up a good point. When using the Red Sea, I give it a good 10 seconds once I see blue before I settle on that reading. If it starts to change, I give it another drop and wait another 10. I haven't given it 20 seconds as you recommended. But I could certainly try.

Yes not only does the testing device itself have some inaccuracy so do we as humans with a process like titration/color identification..

NO3
05/30/2018, 01:29 PM
I don't care if my Calc is 420ppm +/- 30pm.

I think the problem is some people all want to spend $25 on a 50test kit and expect it to scientifically test within +/- 0.5% of the true exact number.

I know going in I'm not going to get an exact number but a range of:
* my calc is really low in the 350 range
* my calc is about right in the 420 range
* my calc is high in the 500 range

All tests imo are just "range finders"

Past that it would take me setting up a C.S.I. Lab in my basement

Hastened
05/30/2018, 01:46 PM
Who cares if your Calc is 420ppm +/- 20

I think the op cares that's why he started the thread. Haha, lighten up bro.

Sent from my ONEPLUS A5010 using Tapatalk

RussC
05/30/2018, 04:08 PM
Yea, just getting a feel to see if others might be seeing similar results when comparing tests. You are right. It’s really just a range.

Something I thought might be interesting is to check my RODI calcium. I guess the test will register it. Who knows. If I get to feeling froggy, I may give it a go.

Joe0813
05/30/2018, 06:59 PM
My Hanna calcium checker is a pile of crap. It's constantly different numbers and constantly reading way off.. calcium was 430 with two different test kits and the Hanna was 552. Same with the Hanna ALK tester. Junk

d2mini
05/30/2018, 07:12 PM
Hanna Alk is tester is the bomb. VERY consistent to the .1 for me.

Joe0813
05/31/2018, 02:08 PM
Hanna Alk is tester is the bomb. VERY consistent to the .1 for me.

My alk tester almost nuked my tank. Would read 7.7-8.2 and I'd bump my dosing up. Come to find out, my alk was all the way up to 15

homer1475
05/31/2018, 02:20 PM
My alk tester almost nuked my tank. Would read 7.7-8.2 and I'd bump my dosing up. Come to find out, my alk was all the way up to 15


I would dare to say user error. My Hanna ALK meter is within .1 of salifert or redsea kits(yes i have all 3, if one is off and I can cross reference with the other kits).



You do realize your supposed to use the same cuvette for both the zeroing of the meter(first step), and the color comparison? Changes in the glass can affect how the meter reads. No 2 cuvettes are the same.

Joe0813
05/31/2018, 05:23 PM
Used the same glass and everything .

Joe0813
05/31/2018, 05:24 PM
I'm not the first one to have issues with them, I've seen numerous posts with issues with the Hanna checkers

d2mini
05/31/2018, 10:15 PM
Must have been something wrong with your unit or the reagent. Hey, it happens. No product is 100%.
But that's the first time I've heard anything bad about the Alk checker.

2_zoa
06/01/2018, 12:02 AM
So, as mentioned by another. I wonder about giving the red sea test enough time. I know that in the beginning of using Red Sea tests. When I thought I was done I went ahead and waited the extra time only to see I needed to add another drop or two.

I also wonder about the water the sample is cut with. Unsure water will skew the result.

On top of those, I wonder about the testing location. After sitting in on one of Tullioís presentations on lighting. Then spending another 30 mins one on one with him. I totally forgot to ask this question. What type of lighting (temperature/color) is best, when testing or using a titration test? Iíve never seen this posted or written about. Iíve never seen anyone care. Yet, in my own pseudo tests. I can take a end test result from one rooms lighting and background color to anotherís......and get different test results. Titration seems to be very easily swayed based on surrounding conditions.

outssider
06/01/2018, 06:15 PM
So, as mentioned by another. I wonder about giving the red sea test enough time. I know that in the beginning of using Red Sea tests. When I thought I was done I went ahead and waited the extra time only to see I needed to add another drop or two.

I also wonder about the water the sample is cut with. Unsure water will skew the result.

On top of those, I wonder about the testing location. After sitting in on one of Tullio’s presentations on lighting. Then spending another 30 mins one on one with him. I totally forgot to ask this question. What type of lighting (temperature/color) is best, when testing or using a titration test? I’ve never seen this posted or written about. I’ve never seen anyone care. Yet, in my own pseudo tests. I can take a end test result from one rooms lighting and background color to another’s......and get different test results. Titration seems to be very easily swayed based on surrounding conditions.

I check my sample under a white fluorescent light in my otherwise dark garage. I hold the sample right up to the white fluorescent tube. It's very easy to detect the slightest change back to violet/ blueish color. It can take as many as 4-5 drops to keep the sample blue after it first turns blue.

2_zoa
06/01/2018, 07:00 PM
I check my sample under a white fluorescent light in my otherwise dark garage. I hold the sample right up to the white fluorescent tube. It's very easy to detect the slightest change back to violet/ blueish color. It can take as many as 4-5 drops to keep the sample blue after it first turns blue.

Thank you for sharing your experiences.

Iíll give a darkish room a shot on my next test. Currently I stand in the same spot facing the same direction in my kitchen to get roughly the same backlighting.

josephxsxn
06/01/2018, 07:48 PM
I bought the certified check set solution. When I get worried it's acting funny I can ensure the colorimeter is still working right.

https://hannainst.com/hi758-11-marine-calcium-checker-calibration-set.html

outssider
06/02/2018, 04:52 PM
I bought the certified check set solution. When I get worried it's acting funny I can ensure the colorimeter is still working right.

https://hannainst.com/hi758-11-marine-calcium-checker-calibration-set.html

coming from a lab and that's the best they can do for accuracy ????

"""Supplied with Certificate of Analysis"""
"""Standard value of 400 +/- 20 ppm calcium @ 25įC """
"""Reusable with long shelf life stability"""

NO3
06/02/2018, 09:43 PM
Im seriously questioning my purchase of Hanna ALK.

Hanna consistently reads 2 sometimes 3 dKH higher than my Red Sea drip test. I've tested against known-alk.

Just 2 days ago Hanna said 13.1 dKH and Red Sea was at 11.5. Dud tests side by side

At 13.1 yellow flags start flying in my head
At 11.5 Im more relaxed and ok with that #

d2mini
06/02/2018, 10:10 PM
Im seriously questioning my purchase of Hanna ALK.

Hanna consistently reads 2 sometimes 3 dKH higher than my Red Sea drip test. I've tested against known-alk.

Just 2 days ago Hanna said 13.1 dKH and Red Sea was at 11.5. Dud tests side by side

At 13.1 yellow flags start flying in my head
At 11.5 Im more relaxed and ok with that #

Why on earth are you running alk so high?
Really high nutrients?

NO3
06/02/2018, 10:54 PM
Why on earth are you running alk so high?
Really high nutrients?

I use Fritz RPM saltmix which has hi alk out of the box.....and I'm Dosing Kalk.

Always been at 10-12

I don't get concerned until I tip 13.

I don't have SPS bc their too hard to keep happy. 98% zoas/palys keeps me happy bc zoas come in a bazillion color patterns

d2mini
06/03/2018, 07:25 AM
I use Fritz RPM saltmix which has hi alk out of the box.....and I'm Dosing Kalk.

Always been at 10-12

I don't get concerned until I tip 13.

I don't have SPS bc their too hard to keep happy. 98% zoas/palys keeps me happy bc zoas come in a bazillion color patterns

Ok, just seems high to me, and coral type doesn't matter.
Average NSW is like 7.5-8.0. Why dose Kalk? Especially if your salt already has elevated levels? Or why use a salt with elevated levels if you are going to dose Kalk? Sometimes people will run high Alk to push sps growth, at the risk of possible burnt tips. But with mostly zoas... I'd think 9 would be a sweet spot. At least then you'd have a lot more leeway either direction if something were to go wrong.
FWIW, my tank is sitting around 7.6 and my zoas, lps, sps, clam, etc are all doing well. My nutrients are low so I tend to see better color in my sps running the lower end.

RussC
06/03/2018, 02:37 PM
I've been very happy with my Hanna ALK checker. its been spot on. And I just had a much more successful test with my Hanna CA checker yesterday. For some reason, that particular test was only 17 ppm difference from the Red Sea. Life is good.

homer1475
06/03/2018, 03:35 PM
I've read, I do not own one, that they have a new pipette for the CA checker that makes it much more accurate?


If it weren't for all the bad reviews the CA checker gets, I would also own that one. I like the hanna meters, makes testing so much easier and faster.

RussC
06/03/2018, 07:44 PM
I think I’ll get a more consistent Hanna checker reading compared with my red seas calcium check as I get more used to the Hannah checker.