I got a new water purifier a few weeks ago from Seychelle.com that works with a screw top bottle. The filter element qualifies as a purifier because it is EPA approved to remove viruses and bacteria to 99.9999%, and other biologicals like Giardia and Cryptosporidium to 99.99%. That’s excellent. It even removes chemicals such as DDT, MBTE, and Benzene, as well as dissolved solids like arsenic, lead, mercury, zinc, and aluminum.
Unfortunately, the bottle leaks around the threads, where the top joins the rest of the bottle. I tried wrapping the threads with plumbers tape, but even that doesn’t stop the water in the bottle from running out along the sides and down my chin when I drink. That’s bad because it compromises the entire system, leading to something that’s called cross-contamination, because good water is mixes with bad, either in the bottle or on your mouth and hands.
I really should know better by now. Every bottle system that I’ve ever tested, where there’s a filter element in the cap, has failed for me, including the McNett Aquamira Water Bottle and the Bota Outback Bottle. They also suffer from leaks around the water cap threads.
The only in-bottle filters that don’t suffer from this defect are those where the filter element reaches to the bottom of the bottle, such as the Katadyn Micro Bottle Water Filter. The only problem with that system is that it is just classified as a filter by the EPA and not a purifier because it won’t remove viruses without additional chemical treatment.
Darn! I hoped the Seychelle was going to be a winner.
Disclosure: The author owns this product and purchased it using their own funds.