[Bonzer]

I understand this is a DI-only system - is that correct?

What filters are they equiped with and do you have to replace the whole filter when the colour has changed or can you refil with new media?

[crystal.clear]

yes ur right it is only a di unit. which means if ur water tds is hogh you will go through alot of resin. you have to buy new resin from ionics which is not cheap. it all depends on ur tap tds