I would like to add a Dad perspective to this answer.
I have the Hiker Pro and love it. And the Hiker before it. I carry KlearWater when I am doing fast-packs. But when I am with my kids I bring a Katadyn Vario Microfilter for a couple reasons.
One, I want them to enjoy their trips right now as these are the ones that will be impressed on their minds. I fell in love with camping and later hiking immediately, but back in 1968 there was not much to compete for my affections as we did not even have a TV let alone computers , cable, and game consoles. So I make these early years fun and tell them (and show pictures of) my bigger trips that have the opportunity to be even more fun for them.
My son, the picky eater (that my mom says God gave me to pay her back) would never go for drinking drop-treated water. He lives in Minnesota and knows what lives in the water. 200 species of mosquitoes and pollywogs…
Two, they love filtering it themselves. It takes me about 4 times as long to get water when they are there. But that is cool. They are learning while thinking they are just having fun. (I guess that is the best way to learn, right?) The Vario is very easy to pump. Plus it is way fast. The charcoal takes the swamp-water flavor out of the gnarliest water sources too.
Further reading of the post made me see you may have chemical concerns too. If that is the case The 1st Need is the way to go. I keep one in MN just for the possibility of treating flood water. They have all those old missile silos across the border in ND you know? Oops, I hope I did not leak a secret…