haha ok guys so the consensus for me not to contract leptospirosis on my next backpacking trip would be to chemically treat the water? kalalau valley in kauai is known for having problems with lepto and i was looking for a way to filter without having to make the water taste bad with chemicals. But if there is no other way, drinking water that doesn't taste spectacular is still better than getting flu like symptoms 11.2 miles away from my car.