thesassyindian
Supporting Member
Which test kits do you use for Alkalinity?
Added!But my main alk and what I think is the best you don't have listed. I use the KH Guardian
Old reagent?I had salifert, and then hot Hanna as well, but now my Hanna consistently shows 2-3dKH lower than Salifert + Red Sea.
So now I'm back to Salifert.
Nope - picked up 2 different batches of reagent. same result. Probably needs factory recalibration.Old reagent?
I didn't know you were in the khg club!!!Can't redo my poll but i have and use a KH Gaurdian as well as Salifert test kit.
Haha ya for about 6 months now. Thinking about getting a 2nd for the 75g but not too enthused about doubling reagent costs to $30 a monthI didn't know you were in the khg club!!!
Why? How did you determine the salifert + red sea is right and the Hanna is wrong?I had salifert, and then hot Hanna as well, but now my Hanna consistently shows 2-3dKH lower than Salifert + Red Sea.
So now I'm back to Salifert.
Checked with a test at the LFS as well.Why? How did you determine the salifert + red sea is right and the Hanna is wrong?
Doesn't answer my question. All you have confirmed is that 3 tests have similar results to 1 that doesn't. All 3 tests ( I assume the LFS uses similar tests requiring a visual confirmation) have 1 thing in common, us. If you truly want to know, get a known sample (either a reference solution or some kind of calibration solution) and use it on all your tests. The best test is NOT to look at the number on the label and test blindly. Give 3 people 3 different tests using the same known sample.Checked with a test at the LFS as well.
Makes sense, to use a known solution. Also, Checked 4x fresh saltwater mixes for the Alk at given SG as per the manufacturer, and again, Salifert and Red Sea were within 2-8% error over the 4 batches. Hanna was consistently lower.Doesn't answer my question. All you have confirmed is that 3 tests have similar results to 1 that doesn't. All 3 tests ( I assume the LFS uses similar tests requiring a visual confirmation) have 1 thing in common, us. If you truly want to know, get a known sample (either a reference solution or some kind of calibration solution) and use it on all your tests. The best test is NOT to look at the number on the label and test blindly. Give 3 people 3 different tests using the same known sample.
Consistently 2-3 dKH lower - all tests were done while not looking at the chart or the graduations on the syringe. Only color change.How much lower?
It surprising how often we do what I call biased corrective actions.
"Should be 8 dkh, but this is not there yet, maybe I didn't see the change, lets drop 1 more. Hmm.. did I see it? Maybe 1 more. Ah... maybe 1 more. There it is. Yup, 8 dkh. Awesome".