My opening comments were based on your initial comments in the first 2 paragraphs of your original post....and also based on my SO's real world experience in 3rd world countries where water sanitation is a real challenge. I thought that information would of been useful or interesting but I guess not.

As for the effectiveness of the straw for personal use, that is up to the end user to decide. You posted and posed a question. I shared my thoughts on a possible shortcoming of the straw that perhaps others may not think of when purchasing these. If you don't appreciate my thoughts nor my SO's valuable experience and resorting to reply in such a snarky manner, then I will drop this forum...