So dumb question...I usually mix my water 1 week in advance in a 20 gal tank then pull it out as I need it...I have an air stone running in there and a circ pump that comes on for 15 minutes every other hour did you think this could be an issue as you mentioned percipitatin?...The checker is only off is the Coral Pro is really 12 dKH. It could be 9.2 dKH, either because the salinity is low, or due to precipitation in the mixing container, or due to an inhomogeneous mix, as folks have noted.
Well I said that a bit tongue in Cheek...it's actually a Hannah H1772-11certified standard for checking your Hannah checker....it's 2 vials that you need to maintain within a certain TEMP range and not expose to light....you then use them as C1 and C2 in your Hannah CHECKER to validate accuracy...they are available on line at multiple outlets...$20 OR $25 I think....but it is a Hannah product... got mine at aquacave...
@Randy Holmes-Farley Just to be clear for others, this product is neither NIST certified, nor even an alkalinity standard, but rather a color standard for absorption validation of the checker. Is that why there is a date for buying a new one, because it really isn't a standard , dear? Thanks in advance hon
Understood! Thanks dear[emoji11]Well, you might have a date on a true alk standard, but for sure, the color/light absorption from an organic dye will change as it slowly degrades, and that is a good reason for a date on that product.
