ro unit
 

I have been very happy with an AquaFX 100gpd that seems to me better built than a Kent RO I've used in the past. The latter, by the way, never lived up to its rated output, whereas the AquaFX has exceeded its rating even though I do not use warm water, which is supposed to make the unit more efficient. The AquaFX is also generally less expensive, I think. The one I have is only the standard 3-stage RO, but they sell 4 and 5 stage RO-DI units as well.

George