JennM;529295 wrote: Well you needn't have thrown away the Seachem MG kit. I don't use the alk tests they come with, but the MG test is useful and accurate, and has a long shelf life. You can always test the reference solution to make sure it's still accurate, and/or call Seachem with the lot number to confirm that. Waste of a $49 test kit by throwing it away :-/
6 meq/L is the upper end of what Seachem recommends... they recommend 4-6 meq/L (and yes, I know that contradicts what RHF recommends, but it actually jives with what Tullock says, so it depends who you are a disciple of...)
It doesn't match with your dKH reading but dKH is only carbonate hardness, and the Seachem test tests total alkalinity (carbonate, borate and hydroxide combined).
Since you've concluded that it's particulate... a filter sock and perhaps some Clarity if you haven't already...
Jenn