Ato

[Chase31]

Was Thinking about making my own ATO for my 35G(all together) tank,my plan was to have a 2L bottle with two airline tubes one long one short, when the short one comes out of the water it will allow air into the bottle and thus releasing water into the tank,

The only problem i see is will the salt diffuse into the water in the bottle instead of having freshwater go back in?