@Randy Holmes-Farley Can I use a Hanna Salinity Checker to get the potency?I'm using BSR Kalk and a KS-100 stirrer and pH is reflecting dose added. Last couple of dKH readings have been going up so maybe substrate/rock/CUC was absorbing the initial dosing and now the numbers are rising.
With the re-calibrated GHL, my dKH is showing about a .2dKH drop in 6hrs (I stopped dosing kalk last night to see consumption). If that is roughly accurate, I should be seeing ~.2dKH increase per day. Given that my ASW is 7dKH-ish and my current tank reading is 8.1 and I've been running for about a week with kalk, I'm thinking things are accurate enough for discussion. I'll keep monitoring but am still perplexed about what is consuming the Kalk. I'll also look to measure the potency of the kalk. Any easy way to do that?
Marine Salinity Tester - HI98319 - Hanna Instruments
"...the HI98319 Marine Salinity Tester measures conductivity (EC) to determine the salinity"