it says in chinese that
you need to put in a cup for 30 mins for the powder to dissolve
every 50 liter water you add 1 to 2 scoops every 2 ~ 3 days add once
and then you can add it into the food as well
I've used Skirakura CA+ to adjust my tap from 3GH @ 40TDS to 4GH @ 80 TDS but YMMV... my tank TDS normally ends up being around 135tds post WC after adding BW Shield, Vital & calcium. I do notice that the Fluval Mineral Supplement raises TDS more than Shirakura CA+ but the difference is like 15ppm give or take a few points.