EEVblog 1454 - Water from Air AGAIN - The Kara Pure - Page 1
Forum section: electronics / general

author: EEVblog
author_rank: Unknown
timestamp: February 08, 2022, 12:33:58 am
content: Another Indiegogo marketing takedown.The Kara Pure water-from-air dessicant dehumidifier that costs US$1800 uses a $20 alkaline mineral filter to give you tasty filtered water for the cost only 1400Wh/day in energy, at best.So dumb it hurts.https://www.alibaba.com/product-detail/ALK-alkaline-water-filter-cartridge_62009370049.html

author: thm_w
author_rank: Super Contributor
timestamp: February 08, 2022, 10:54:36 pm
content: That $10 alkaline filter cartridge looks super sketchy."Mineral Media Function: Healthy & natural minerals release, Ca, Mg, Li, Zn, etc"OK, so what levels ends up being introduced? And what is the "etc" part, do we get some Pb in there too?"Antibacterial Media Function: Inhibit bacteria breeding Antibacterial ratio:> 99%"The gold colored balls, anyone guess at what these are made from?

author: tchicago
author_rank: Regular Contributor
timestamp: February 09, 2022, 01:26:29 am
content: How do they extract water from the dessicant? I thought the desiccant by definition captures the molecules of water in microscopic pores due to extreme surface tension, making it nearly impossible to take it back out. Probably the only way to get it out is to heat it up so it gets released as a vapor, but then we back to square 1: turn vapor into water.Also why do they need filtering so much? Whatever they filter out, where it comes from? Is that pollution comes from the desiccant itself, which means it degrades as a part of use or leaks into the produced water? So that both filters and the desiccant need to be replaced/replenished for continued use.

author: thm_w
author_rank: Super Contributor
timestamp: February 09, 2022, 01:41:25 am
content: Quote from: tchicago on February 09, 2022, 01:26:29 amYou have to use very good filtering because you are pulling in all the junk thats in the ambient air (dust, bacteria, etc.), then letting it sit for hours at room temperature.You can read about desiccant dehumidifiers, the material is reusable:https://www.toyotomi.eu/product-category/dehumidifying/dessiccant-type-dehumidifier/https://www.dehumidifierbuyersguide.com/desiccant-dehumidifier-reviews/https://destech.eu/operation-principle/

author: cortex_m0
author_rank: Regular Contributor
timestamp: February 09, 2022, 01:14:55 pm
content: If the power usage Dave quoted from the inventor is correct, this thing would be ~2/3 of my whole home's power usage in the months that I don't need the heat. It would use 420 kWh per month, my average utility bill was for about 650 kWh each month in the spring/summer/autumnNot to mention the heat this dehumidifier generates will have to be taken out, again, by the AC.

author: BrianHG
author_rank: Super Contributor
timestamp: February 10, 2022, 03:42:59 am
content: This is going to such an extreme, maybe we should just get the crappiest water and steam distill it.I prefer to drink steam distilled, non-mineralized water anyways.

author: MrMobodies
author_rank: Super Contributor
timestamp: February 10, 2022, 05:43:07 am
content: Quote from: EEVblog on February 08, 2022, 12:33:58 amLike with audiophoolery is their a name for this one where they pay $1800 just so that they cantaste the difference?Just looked at their Indiegogo campaign and 3 days ago a backer is already requesting a refund:https://www.indiegogo.com/projects/kara-pure-make-pure-water-from-the-air#/discussionQuote

author: thm_w
author_rank: Super Contributor
timestamp: February 10, 2022, 10:02:17 pm
content: Quote from: BrianHG on February 10, 2022, 03:42:59 amhttps://www.who.int/water_sanitation_health/dwq/nutrientschap12.pdfHopefully you have some other way of getting these minerals.

author: thm_w
author_rank: Super Contributor
timestamp: February 10, 2022, 10:04:52 pm
content: Quote from: MrMobodies on February 10, 2022, 05:43:07 amSeems like these people have no clue what they are doing, not too surprising, indiegogo should be able to refund them directly if the campaign has not ended:https://support.indiegogo.com/hc/en-us/articles/526876-Refunds-Can-I-get-my-money-back-

author: MrMobodies
author_rank: Super Contributor
timestamp: February 11, 2022, 07:42:05 am
content: Just noticed that one of them has wisened up a bit:QuoteNow someone else wants a refund:QuoteGood that the project owner is going to refund them.

author: BrianHG
author_rank: Super Contributor
timestamp: February 11, 2022, 12:05:21 pm
content: Quote from: thm_w on February 10, 2022, 10:02:17 pmBS.There are more minerals in half a single potato chip than a liter mineral water.Unless you live exclusively off of green vegetation exclusively from a rain forest where you will have a lack of salt in your diet, I don't think it is possible today to have such a mineral problem unless you have a dietary problem or a digestive system which cannot absorb specific minerals due to a genetic problem in which case mineral water will not be enough to help you.

author: thm_w
author_rank: Super Contributor
timestamp: February 11, 2022, 10:11:44 pm
content: Quote from: BrianHG on February 11, 2022, 12:05:21 pmI'm not referring to special "mineral water", just regular water in general.Anyway, did you read the link?Quote

author: tszaboo
author_rank: Super Contributor
timestamp: February 11, 2022, 10:15:53 pm
content: I have one of these dehumidifiers in the attic. It eats 350w on low setting, makes a few liters a day, when the humidity is high (65-70 ish). I would never drink that water, it's great for the clothes iron though.I also have a Brita filter, that makes the same amount of clean water in 2 minutes.

author: Smokey
author_rank: Super Contributor
timestamp: February 12, 2022, 12:09:16 am
content: Sounds like there needs to be a whole forum sub-section dedicated to "water from the air" devices.On a serious note, when fusion power finally gets here and we actually have a virtually unlimited source of clean electricity, all this stuff then becomes viable right? How does condensing water from the air compare to desalinization power consumption wise?

author: thm_w
author_rank: Super Contributor
timestamp: February 12, 2022, 01:38:49 am
content: Quote from: Smokey on February 12, 2022, 12:09:16 amDesalination is in the thousands of liters per day capacity, and uses less power (5 kWh/m3). But you need a plant by the ocean or to live by the ocean. Also the initial cost is a bit higher, unless you go with steam distillation, which uses more power (15-20 kWh/m3). When you have unlimited source of clean electricity, a lot of options would become available.https://www.mdpi.com/2227-9717/9/2/262/pdf1 m3= 1,000 L10L / 14kWh = 1400 kWh/m3

author: Sterno
author_rank: Contributor
timestamp: February 16, 2022, 10:44:27 pm
content: We were generating water from air at work again recently.I drained about 200 Litres of water from one of our compressor air tanks.Apparently the automatic tank drain valve has been stuck for a while.