I been using Red Sea but must admit my Alk at 11.0 consistently may be from RSCP. I am only dosing kalk in ATO and have not had to raise Alk in months. Conversely my Ph stays around 7.9 never above 8.05 so I think I am breathing in CO2. gag cough....
local, by the box at SWJ, then I fill one of my old aquavitro buckets with it to keep it fresh.
I believe map is $64, but seen them for $55-60 around town.
Buying it local is actually cheaper than online...
How big of box are we talking about? How many gallons will it mix? I may try this next time. JP