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29 votes
Accepted

Why don't toilets use saltwater?

The main answer is logistical. Building a network of pipes to convey water to houses is a major effort, and most places where that's been done found it extremely expensive. Providing a second set of ...
Ⴖuі's user avatar
  • 1,307
20 votes

Why don't toilets use saltwater?

Catalina Island does use salt water for toilets. It's a small community, however, and they seem to be shifting towards freshwater due to corrosion issues inherent to salt water utilization. From ...
acpilot's user avatar
  • 348
10 votes
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Can pumped water energy storage be combined with rainwater harvesting?

Water loss is not the issue, because you need a lot of water to make it work at all. Even if your dams lose 30% of their water every year, that's about 0.1% per day. System losses in the best large-...
Ⴖuі's user avatar
  • 1,307
6 votes

Why is there so much scarcity of water?

There is no global scarcity of water. Some areas have a scarcity of potable water per person. There are several ways to fix that: Move the people to where there's sufficient potable water for them. ...
410 gone's user avatar
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6 votes
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Coffee grounds to water plants

I nearly killed a plant (grape vine) by discarding coffee grounds regularly into the pot, while working at a bar/café. I told the owner it was great for plants, but didn't realise they could actually ...
stragu's user avatar
  • 3,292
5 votes

How large a solar panel would I need to electrolyse 1 liter of water?

The flippant answer is "it depends how long you're prepared to wait". But, let's assume that you want to electrolyse a litre of water an in hour. You've identified above that the energy needed to ...
Flyto's user avatar
  • 3,690
5 votes

How does one utilize the low pressure of a rain barrel?

Ok, collecting water is one thing. My first question would be "why collecting water at base level?" Just one meter (yard) higher could generate some pressure to distribute the water better. Most water ...
Salt's user avatar
  • 929
5 votes
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Does oil spilled in backyard contaminate groundwater?

I question the blanket assertion of 1 liter of oil contaminating 1 million liters of water. That's 1 part per million. This article: https://www.who.int/water_sanitation_health/water-quality/...
Sherwood Botsford's user avatar
4 votes

What are the power requirements for typical water desalinization devices?

Most every device I have seen this far is some fossil-fuel driven high pressure pump. You need to look at more devices. We live on a sailboat and make our own water and every single boat (sail or ...
swimex's user avatar
  • 41
4 votes

How to benefit from air-conditioning water

You certainly can use it as water to grow plants. But better not drinking it, since it can host bacteria in the long run. There is good stuff about it here: http://www.slate.com/articles/...
J. Chomel's user avatar
  • 1,407
4 votes

Reference request - Overview over established solar thermal desalination technologies

Here are a couple of papers published between 2011 and 2016: Ranjan, K. R., and S. C. Kaushik. 2013. ‘Energy, Exergy and Thermo-Economic Analysis of Solar Distillation Systems: A Review’. Renewable ...
stragu's user avatar
  • 3,292
4 votes

Does the world have a defined amount of water?

Yes, there is a limited amount of water on (and in, and above) Earth. There's a limited amount of everything on Earth. Most things on Earth stay on Earth due to the pull of gravity, gaseous water ...
Highly Irregular's user avatar
4 votes

How can we all together clean up the vast plastic carpets in our oceans?

Prevalence of garbage in the oceans A recent study in Nature Scientific Reports finds that the "Great Pacific Garbage Patch" is massive, and keeps growing. From the article, "Evidence ...
LShaver's user avatar
  • 11.9k
4 votes
Accepted

Does decanting eliminate heavy metals in water?

Precipitation and decantation are two different things. If left alone, dissolved heavy metals would never go down to the bottom of a container (countering the gravity pull for an ion over 10 cm costs ...
Silmathoron's user avatar
4 votes

What is the environmental impact of detergent pods?

A study published in 2021, conducted by Arizona State University and Plastic Oceans International, claims that the polyvinyl alcohol (PVA) used in both dishwasher and washing machine pods is not ...
RosePumpkin's user avatar
4 votes

Why does climate change lead to more diarrhea?

I’m not aware of any definitive studies or reputable sources of information that directly link climate change to increased cases of diarrhea. I’d be interested to see any if anyone happens to have a ...
Dustin Mears's user avatar
3 votes

Is it environmentally sensible to clean a paint roller?

Not an answer directly, but can make the resource gap wider: I'm similarly concerned about the amount of water used and found that the amount of water used considerably reduced, by making (or probably ...
user3418765's user avatar
3 votes
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Is it environmentally sensible to clean a paint roller?

As you're in the UK, the environmental cost of tap water is pretty low. And given that the alternative is to replace the roller, then although I haven't looked at a full lifecycle analysis, I'd be ...
410 gone's user avatar
  • 14.7k
3 votes

Sizing a stormwater detention pond

Start here: Quality Farm Dugouts When doing this for a farm, the usual calculation (Central Alberta Climate) is to plan for 2 years use, plus 2 years evaporation. Dugouts should be as deep as ...
Sherwood Botsford's user avatar
3 votes

How large a solar panel would I need to electrolyse 1 liter of water?

Looking at it from systems I can buy rather than theory, if you want 1 litre per hour you need 3.67kW of hydrolysis output from your system, but the hydrolosis is not 100% efficient. There are two ...
Móż's user avatar
  • 3,874
3 votes

Processing grey water (sink, shower) in off-grid situation

I was faced with a similar question a couple of years ago. The best solution I could come up with was to feed the grey water into an area occupied by plants that consumed 'large' quantities of water ...
Tim's user avatar
  • 2,824
3 votes
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Are aluminum sheets appropriate for rainwater catchment roof?

You've raised a few issues in your posts, so having just built a new house I'll address those I'm able to: To start with, I live in a country/area where corrugated steel roofing is the absolute norm ...
Tim's user avatar
  • 2,824
3 votes

How does one utilize the low pressure of a rain barrel?

Plant a birch tree. Run a hose from the barrel to the tree. Put a soaker hose on the hose, and set it far enough from the tree to go round once. E.g. for a 50 foot soaker hose it would about 8 feet ...
Sherwood Botsford's user avatar
3 votes
Accepted

What is the energy and greenhouse gas footprint of Skysource/Skywater water generator?

There's a little bit of information on their FAQ: Energy ranges from less than .4KWH/Liter to over kWh depending upon climatic conditions. And that's just as they've written it. The upper limit is ...
410 gone's user avatar
  • 14.7k
3 votes
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Why not use scarce California water for almond milk?

The issue is really with sustainability rather than scarcity, and it is also linked to ecological issues. An article in the Berkley University web site gives some background information. In order to ...
M Juckes's user avatar
  • 1,021
3 votes
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How can I conserve energy and water in my bathroom?

Others have already suggested low flow fixtures and reducing water usage, but here are a few other ideas, from least to most expensive: Turn down your water heater. The U.S. Department of Energy ...
LShaver's user avatar
  • 11.9k
3 votes
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Will this work to prevent my pipes from freezing?

Clarification of terms: Your tap is the downstream end. The City water supply is the upstream end. My understanding of your situation: City Waterline Building shutoff vale Local distribution valve ...
Sherwood Botsford's user avatar
3 votes
Accepted

Are there long-distance water pipelines emanating from the North American Great Lakes region? Why or why not?

I can provide an answer for the first part of the question: No new water diversions out of the Great Lakes region are allowed. Great Lakes water agreement The 2005 Great Lakes–Saint Lawrence River ...
LShaver's user avatar
  • 11.9k
3 votes
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Is residential water pumping common?

Available data indicates that; 1) electricity usage for water pumping at homes is minimal; and 2) most municipal water systems provide more pressure than required for residential uses Is it common for ...
LShaver's user avatar
  • 11.9k
3 votes
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How would a garden adapted to drought look like?

This concept is called xeriscaping, a term coined in 1981 by the water authority of Denver, Colorado, USA, in efforts to encourage residents to reduce water usage in their gardens and yards. ...
LShaver's user avatar
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