I asked Ms Slickcraft and she said not really any taste at all, a lot like our well water which is a lot like spring water. The carbon filter helps with the taste issue. You really need the sediment and carbon filters in front of the UV unit.
We use the filtered/purified lake water for coffee, cooking, ice cubes and occasional drinking. We keep a gallon or two of water from home at camp for the occasional fussy visitor. Of course there is always beer.