Instant Ocean. Cheap, and consistent quality.
Challenge — ask your exotic salt vendor to disclose the source of their raw materials and who blends their salt for them. Most will not tell you. To be even remotely competitive, it is unlikely that most of these companies are doing it themselves, and instead are simply buying from one of the few sources out there, and likely doing so geo based. Meaning the “same” salt on two different continents could easily be two different source blenders and different raw materials.
There may be others, but here are manufacturers that I know of. I assume almost all other brands come from one of these by contract - or China.
- Spectrum, U.S.
- Fritz, U.S,
- Tropic Marin, Germany
- HW Wiegandt, Germany
- Red Sea, Israel
- Aquaforest, Poland
- ESV, U.S.
- Aqua Medic, Germany
- D-D, U.K.