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#300629 - 01/25/22 08:19 PM Review of Grayl GeoPress Water Purifier
Blast Offline
INTERCEPTOR
Carpal Tunnel

Registered: 07/15/02
Posts: 3760
Loc: TX
Last week a buddy and I did a three-day, 30 mile, unsupported hike out in Big Bend backcountry. This involved carrying 6 liters of water (each, per day) to make the 6-7 hour hike from one spring to the next. The trail included multiple 1000-3000' inclines. It was brutal but beautiful country.

The original plan was to purify the spring water by boiling, but once we realized the amount of fuel and time required, that process became a no-go. We both carry Life Straws but they are a cumbersome way to drink while on the move. Another backpacker buddy suggested a Grayl GeoPress, which works kind of like a coffee French press, but with a super filter system. One fills the outer bottle with raw water, inserts the inner bottle with filter on the bottom, and slowly presses the inner bottle into the outer bottle. In about 30 seconds you have turned scum-covered water filled with bird poop into 750mL of clean, clear, tasty, cool water! It took us 20 minutes to fill twelve one-liter bottles, and that included drinking a lot of the water we were producing.

The Grayl was a gamechanger, especially when we reached the last spring and discovered it was dry. We had to hike to a band of cottonwoods (sign of water in the Southwestern deserts) and dig a hole under them to get water. By then we were partially dehydrated. Once the Grayl purified this water we could drink it without having to wait for it to cool down from boiling. Truly a lifesaver!

According to the Grayl specifications, the filter system removes bacteria, spores, viruses, pesticides, herbicides, heavy metals, and other common, North American contaminants from up to 250 gallons of raw water. It can NOT make brackish or salt water drinkable. Using a bandana to pre-filter sediment and debris from the water helps prolong the life of the filter. The inner bottle has a tight seal so you can carry it filled with the filtered water without worry of it leaking.

Amazon Affiliate* link to Grayl GeoPress: https://amzn.to/347HIrk
-Blast


Edited by Blast (01/25/22 08:21 PM)
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*As an Amazon Influencer, I may earn a sales commission on Amazon links in my posts.

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#300630 - 01/25/22 10:24 PM Re: Review of Grayl GeoPress Water Purifier [Re: Blast]
Herman30 Offline
Addict

Registered: 08/08/06
Posts: 458
Loc: Finland
I have so far only used my Geopress to make foultasting tapwater taste neutral in Tallinn. It is drinkable and won´t make you ill but the taste is not good.

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#300632 - 01/25/22 11:02 PM Re: Review of Grayl GeoPress Water Purifier [Re: Blast]
Phaedrus Offline
Carpal Tunnel

Registered: 04/28/10
Posts: 3043
Loc: Big Sky Country
Nice! I've read good things, might have to try one.
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#300633 - 01/25/22 11:41 PM Re: Review of Grayl GeoPress Water Purifier [Re: Blast]
KenK Offline
"Be Prepared"
Pooh-Bah

Registered: 06/26/04
Posts: 2191
Loc: NE Wisconsin
I'm starting to really like this guy's videos. Here he reviews the Grayl Geopress.

https://youtu.be/tpd0tHdZGCw

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#300665 - 02/04/22 03:49 PM Re: Review of Grayl GeoPress Water Purifier [Re: KenK]
Blast Offline
INTERCEPTOR
Carpal Tunnel

Registered: 07/15/02
Posts: 3760
Loc: TX
Originally Posted By: KenK
I'm starting to really like this guy's videos. Here he reviews the Grayl Geopress.

https://youtu.be/tpd0tHdZGCw


He makes a good point about mucky water plugging the Grayl's filter. Areas like that would demand pre-filtering or maybe even flocculation with some alum. Here's information on backpacking water treatment flocculation: https://backpackinglight.com/alum-water-clarification-backpacking/

-Blast


Edited by Blast (02/04/22 03:49 PM)
_________________________
Foraging Texas
Medicine Man Plant Co.
DrMerriwether on YouTube
Radio Call Sign: KI5BOG
*As an Amazon Influencer, I may earn a sales commission on Amazon links in my posts.

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#300666 - 02/04/22 04:00 PM Re: Review of Grayl GeoPress Water Purifier [Re: Blast]
Herman30 Offline
Addict

Registered: 08/08/06
Posts: 458
Loc: Finland
For my Geopress I have a Millbank bag to prefilter the water incase I need to filter mucky water.



Edited by Herman30 (02/04/22 04:01 PM)

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#300834 - 03/24/22 09:43 AM Re: Review of Grayl GeoPress Water Purifier [Re: Blast]
paulr Offline
Addict

Registered: 02/18/04
Posts: 495
I think it is conventional to use coffee filters for prefitering. That should get all but very quite fine particles out.

Looking at the Geopress, basic specs are: 24 oz built-in bottle, costs $100, weight 450g, filters 5L/minute. There is a smaller version with 16oz bottle weighing 354g that does 3L/minute, and a 2L/minute 309g model, both of which cost a little less. The manufacturer website is grayl.com.

I had not heard of this before and it seems nicer than the old Katadyn and MSR stuff that I've looked at. Thanks!


Edited by paulr (03/24/22 11:01 PM)

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#300840 - 03/25/22 08:08 PM Re: Review of Grayl GeoPress Water Purifier [Re: paulr]
Herman30 Offline
Addict

Registered: 08/08/06
Posts: 458
Loc: Finland
Originally Posted By: paulr


Looking at the Geopress, basic specs are: 24 oz built-in bottle, costs $100, weight 450g, filters 5L/minute.

Having a Grayl myself, I would say no way you can filter 5 liter/minute. I´d say 2 liter at the most per minute.

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