Have a Steripen Traveler Mini and love it. 105g with batteries.

It is a big savings versus the MSR Waterworks I used to carry. I spend most of my backpacking time on trout streams so silt is generally not an issue for me. Saved the Waterworks in case of trips elsewhere.

If the unit/batteries ever fail, I keep 10 Katadyn Micropur tablets (8 grams) in my emergency kit. I carried those emergency tablets when I had the pump filter as well.