Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
More accurate, or more precise?*whispers* titration-based Alk test kits are more accurate.
(but preferring a fully automated eyeball is totally understandable)
Done correctly, both.More accurate, or more precise?
*whispers* titration-based Alk test kits are more accurate.
(but preferring a fully automated eyeball is totally understandable)
Sure you’re reading the right card?I like my Red Sea alkalinity titration test, but the directions show the sample changing from blue to red. It never goes red!!!! Oh the frustration...it kind of goes yellow to my eye. Do you have one you like more than the others?
I prefer the Hanna checker because I’m obsessive and will obsess over the minute degrees a titration can reveal. But my checker’s .1 dKh precision is probably plenty for a tank.
From Hanna site.
”Accuracy @ 25°C/77°F ±0.3 dKH [or] ±5% of reading"
So at alk of 10, the uncertainty is actually 0.5dkh.
From Hanna site.
”Accuracy @ 25°C/77°F ±0.3 dKH [or] ±5% of reading"
So at alk of 10, the uncertainty is actually 0.5dkh.
Hanna states all their uncertainties asI am not sure we are doing the math right there. How can it state plus or minus .3 and then you say it can be off .5?
The way you are doing the math the lower the alk the less the uncertainty.
Sure you’re reading the right card?
I use this Red Sea Alk pro sometimes.
In the pic you can see it starts blue and yellow is too far, you can color match to a target green on the card.KH | Alkalinity Pro Test Kit
Red Sea’s KH/Alkalinity Pro Test Kit is an advanced titration test, measuring the level of buffers in your reef aquarium to an exceptionally high accuracy of 0.05 meq/l (0.14 dKH). This test kit enables the accurate dosing of Red Sea's Reef Foundation B supplement (buffer) which is part of the...www.redseafish.com
If you search, Randy posted a DIY alk test that just uses a calibrated pH meter 100mL of tank water and 0.1M acid. No color change needed. Just read pH to get endpoint. Jim Welsh contributed an awesome pH calibration check in that thread to make it even better. Absurdly accurate.
Normally, that kind of accuracy not needed, but people forget the error is bigger in the Hanna colorimetric method, and start changing their dosing because the Alk “went up/down”.
Whoa. I think they changed recipe in recent years and it sounds like you have the new chemicals and the old card somehow!That's the test I use... and I have a different card!!! What the heck??? I see that green hue and go past it everytime to try to get to red like my card says to do (which is yellow in my samples)... lol
Here's mine: