For lowering or removing TDS, Tulsion MB-101 CC is a great resin to use. It comes in a blue & black resin (1:1 ratio) and when exhausted turns orange.What is Tulsion DITULSION MB -101 CC is a mixture of strongly acidic cation exchangers in in 1: 1 volumetric ratio of Tulsion® T -46 in hydrogen form and strongly basic anion exchange res in Tulsion® A-33 in hydroxide form.TULSION MB -101 CC has a specially designed indicator which by it's property of change of color from green to amber indicates its exhaustion.