I believe what Randy is saying is that mixing 35 grams in 1 liter of water will be below 35ppt. I know that with my mix it's around 38.2g/L. If I used my salt mix and used 35g/L, I would end up somewhere close to 32ppt.
From what I have seen, the recommended ratio is a good starting point, but salt or RODI may need to be added to get to your needed concentration.
From what I have seen, the recommended ratio is a good starting point, but salt or RODI may need to be added to get to your needed concentration.