My tap water is 24 TDS so when i add water i over fill to counter build up of solids over time, still my tubs can hang around 50 or so. After adding water spangles the TDS is much lower. Yesterday it was 15 and i have not been overflowing the water in the past few fill ups.
I picked water spangles(Salvinia minima) for the test because they have shorter roots and double there population daily when i use ferts in my water plant tub.
I don't have the means to test what the plants are removing and what they are not removing but the TDS is really dropping