> Given that current commercial methods kill 90%+ bacteria in water, thus, nothing can be even 2x better That depends how you look at it. Is it 90% killed, or

> Given that current commercial methods kill 90%+ bacteria in water, thus, nothing can be even 2x better That depends how you look at it. Is it 90% killed, or is it 10% survived? If it's 10% survived, then 100m times better is a system where 10/100m % survived instead.