Lifestraw won't work for seawater, Esther, you need a desalination process for seawater and there aren't many, if any, affordable portable options for this. 

G'day Marina,

Yes, the LifeStraw Filters are 0.2 microns, any filter smaller than 1 micron will be effective for amoebas. LifeStraw indicates that this product will filter out 99.999% of all protozoa and amoebas.

G'day Tracey,

No, this particular filter is only designed to be used to suck directly from the water source. If you're looking for a filter that can filter into a bottle or bladder, we'd recommend checking out some of the MSR or Platypus filters found HERE.

G'day Derek,

The lifespan of the LifeStraw Water Filter is not measured in time but in liters.
Each filter will see you right for approximately 4000L.
Hope that helps.

G'day Glenno,

At this stage, we've not had any mention of the green model here in Australia. It is possible that the Australian supplier will bring these in, but at this stage they're all the light blue model.

G'day Glenno,

We've just double-checked the packaging for the Lifestraw, and we can confirm that the Lifestraw will filter 1000 Gal, or 4000L. We'll get our specifications updated to reflect this on the site. Thanks for picking up the discrepancy for us.

G'day Ash,

You shouldn't need to clean the Lifestar Water Filter other than to wipe the end before replacing the cap. The filter needs replacement every 1000L of water so depending on how much you use it you might only need to replace it every few years.