I buy my salt and RO
water from my LFS
, salt always goes in the big container and the RO
for top off in the little one. Today I did my PWC
using the big container as usual and after did my tests to find my salinity really low, the LFS
had put the water the wrong way around. Lesson learnt: never assume the store is right and check your water before you stick it in your tank.....!