Both PUR and Brita market water filters for kitchen faucets. I have had occasion to install both brands within the past year. I don’t have an opinion about either the aesthetics or effectiveness of one brand over the other, but I do have a strong preference for PUR when it comes to installation. Let me explain what I experienced installing each system.
I was overwhelmed at the amount of hardware included with the PUR unit. Apparently, Proctor & Gamble, the makers of PUR, include every conceivable item that might be necessary to mate it to a faucet. Various adapters and washers are necessary because some faucets have internal threads, whereas others have external threads. The diameter of the threads is variable, and I assume there are other variables as well. Anyway, I had no trouble finding the needed accessories to install the PUR filtration unit.
Instructions for the Brita filter system begin by explaining that, if your faucet has external threads, you can, most likely, attach the unit without any adapter at all. The faucet I was working with did indeed have external threads, but they were smaller in diameter than the threads of the Brita appliance. Brita supplies no adapter for such an installation, providing a telephone number to call instead. That number is answered by an automated system that asks for your name and address and tells you that the needed hardware will be sent to you in two to three weeks.
My experience is that, when you buy a plumbing fixture, you generally need or want to install it immediately. Apparently, The Clorox Company, which markets Brita, does not understand this. They save money by supplying what I assume to be seldom-used adapters on an as-needed basis. That only a small fraction of their customers are thereby inconvenienced seemingly is seen as a minor price to pay. Personally, I will never buy another Brita product.
PUR, meanwhile, has increased the user-friendliness of their product line by introducing a new filtration unit that “[i]nstalls in minutes with just one click, without tools” [emphasis in original].
If you’re thinking of filtering the water from your kitchen faucet, I hope my experience will help you choose the right unit.