G'day Steve,

Grayldoesn't specify whether the Geopress will filter out poisons like 10/80, but I've included their exact wording below so you can have a look.  

• Filters: particulates (i.e. silt, microplastics, etc.); activated carbon effectively adsorbs chemicals, pesticides, heavy metals, flavours, and odours

G'day Christine,

I've had a look through all of the information we can get from Grayl and they make no claims about the filter being able to filter out Flouride. As far as I know its fairly tricky to remove fluoride from water, so I'd dare say this won't get rid of fluoride sorry.

G'day Mary,

Grayl advises that you know you'll need to replace the filter when it starts to take 25-30 seconds to press the filter through the water.

G'day Alex,

The short answer is yes, if you're 100% sure that the water source isn't contaminated then you can fill the bottle from the lid opening that you'd normally just drink from. The filter itself will remain in place if you do this, it will just mean that you don't use it to push to water through from the dirty to clean section of the bottle.

G'day Carol,

I've just double-checked the user manual, and Grayl specify that you shouldn't use water greater than 50'C, so if you did want to filter tea it would need to be lukewarm before you pour it into the Geopress, using water that is over 50'C may cause damage to the purifier cartridge. The filter will also be likely to filter out some of the tea itself, as tea will generally have some degree of sediment depending on how it is steeped/made.

G'day Marshall,

No sorry mate, the GEOPRESS won't work with saltwater.  Cheers