I have tried many brands such as Oceanic, RedSea Coral Pro, H2O, Tropic Marin Pro Reef Salt , GroTech Coral Marine Reef Salt and Marine Environment Reef Formula before and current one is SKIMZ Pur Reef Marine due to affordability and surprisingly parameter not bad leh!
Few months ago, tested with API and Salifert test kit, I managed to get the following results;
Salinity at 1.025
KH (API) - 9.4
pH (API ) – 8.1
Alkalinity (API) – 9 dKH
Calcium (API) – 390 ppm
Magnesium (Salifert) – 1280 ppm
Phosphate (Salifert) – 0 ppm
Nitrate (Salifert) – 0 ppm