When you say brine is that in seawater desalination RO or are you using that to include non-seawater RO reject water? You could definitely use it as gray water

When you say brine is that in seawater desalination RO or are you using that to include non-seawater RO reject water? You could definitely use it as gray water but if you are filtering for contaminants, that water would have a higher concentration and if you were pushing it out as gray water, would those areas of the yard have higher levels potentially of contaminants?