[cooper]

Ive got a 2 man van mounted Di system 4 months old everythings been running fine until lately.Having a problem with one of the microbore hoses when i take a tds reading.Checked both hoses A gives zero reading where as B fluctuates between 4 and 13.Ive switched over water outlet connections {pump and Di bottle}and im puzzled as the hoses A & B readings still remains the same.
Can only think that contamination maybe be from within the microbore hose  perishing.

[Sapphire Window Cleaning]

If contamination is being created within the hose, flushing it through would solve that.
try checking the TDS in a mug or drinking glass.




Matt