7.5 SALT is a blend of minerals and trace elements designed to safely raise Total hardness vs Carbonate hardness at a ratio of 1.0/0.42 (dH/KH), buffering pH at around 7.5.
Add 3g / 15L to raise GH to 6dGH (270+/-40�S) in RO water or desalinated water, before adding or using in Aquarium. 1 level spoon (provided) contains ~2g. Aquarium use only. Always keep dry, close lid after use.