What are the filtration specs?? What particle size does it filter out?

Thanks for the question! The filtration specs and particle size do not apply to Sagan Life filters. Here's why: Most water filters make the filter media with holes small enough that bacteria and virus can’t pass through, like trying to put a tennis ball in a hole the size of a golf ball, it won’t pass through. Our Nano Fiber Technology is impregnated with silver which acts as a magnet, attracting all negatively charged bacteria and virus to the filter media, regardless of the size. This makes the filter more effective and doesn’t require priming or pumping. Additionally, Sagan filters are not as fragile as other filters. Ours can drop or freeze and it won’t ruin the filter. Hope this helps! ~the Sagan Life team

is there backflush capability or replacement filters, or after 250 gallons is that it?

These purifiers should be replaced after about 250 gallons - no backflushing. The replacement filters for the XStream Straw and AquaDrum are available on Amazon - B07D41LCKZ Hope this helps. ~April and the Sagan Life team

How long can we stock it before using it ?

Indefinitely! The XStream Straw can be stored in long term storage and will be ready to use when you need it. Additionally, it can be used - then stored - and used again without any difficulties! Thanks for your question! ~ the Sagan Life team

Brand	Sagan Life
Special Feature	Portable
Package Information	Bottle
Item Package Dimensions L x W x H	15.59 x 8.15 x 1.89 inches
Package Weight	0.29 Kilograms
Item Dimensions LxWxH	4 x 2.5 x 7 inches
Brand Name	Sagan Life
Country of Origin	China
Color	Straw Water Filter
Manufacturer	Sagan
Part Number	57092
Size	Lightweight, 2 Foot Straw with 2 Foot Extension

XStream Straw Personal Water Filter Straw

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