I gave up on Salifert for calcium and alkalinity a long time ago. When I buy a new kit, I always test twice with the old kit, twice with the new kit. Salifert Calcium was off by 60-80 ppm from itself, not once, but twice when I made the new kit swap out. The old kit being well within expiry. For alkalinity, Salifert reads about 2 dKH higher than Elos, API, and Hanna. So I gave up on that one too.
I recently bought a Salifert Calcium kit because I couldn't get Elos ordered in. It reads 60 ppm higher than the Elos. Argh...I hate test kits.
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~ Mindy
SPS fanatic.
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