In the long run we are talking about milliters or even parts of for daily dosing.
Not a lot and no real trouble.
I find it interesting that sugar is a carbon source AND when dissolved into water does NOT raise the TDS with the electronic testing equipment!
"If sugar is dissolved in water, does it get measured using a TDS meter?
No. Sugar does not have any charges in water, so the TDS meter does not read it."
This was taken from
Lab 2: Determining TDS
I'm thinking that the dosing may not increase TDS at least and without reference still kind of think the vodka dosing may actually lower the TDS?
Reefers would never know as they generally don't test for TDS past their RO/DI units(we have enough other test!) and with the highest TDS levels going(5000 possibly) who would notice if the TDS dropped 50 -100?
Vodka dosing does remove PO4 which is considered a TDS in water.