Your talking (in non-metric terms) a 22 lb bag of salt that will make 132 gal
of saltwater. That doesn't really seem like enough salt for that quantity of water.
Anyway, buy a big bag or bucket. It will have general guidelines for how much salt to add. Add a little less then what's recommended then test the salinity of the water with a refractometer or a hydrometer, which is less accurate than a refractometer. You want your saltwater to be about 35 ppt or 1.026 SG
. You MUST test the salinity (or Specific Gravity). You can't just add salt and hope you got it right.