>>12820251. if you have the cheap version no, 100% as it does not filter viruses. though normally there aren't that many viruses that could affect you in water. though some like the Human Norovirus are no fun. so there better not be a infected turd floating nearby.
2. the more expensive version does so drinking it should be fine
3. it doesn't filter chemicals so heavy metals, poisonous etc go through. though unless you stick it in chinese factory water it should not matter. and only contain miniscule amounts.
4. taste like from a dead animal or shrek's swamp gas can be addressed with charcoal filter.
>>1282001id say pretty mixed with a normie center. from backyard heros to PCT hiker we have all. but as most have some real life constraints weekend and holiday stuff dominates. but there are extremist like 300$ knife or 5lbs ultra lighters.