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Questions tagged [water]

Questions regarding sustainable use of water, or water's impact on sustainability in general. For questions on [waste-water], [greywater], [seawater], [water-footprint] or [virtual-water] please use that tag.

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91 views

Alternatives to bottled water in the UK

I live in Devon, and tap water in my household does not taste consistently. When I moved in my current property, the neighbours warned me that they had been buying bottled water since 20 years, ...
3
votes
2answers
115 views

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

We've been considering getting a rain barrel, and I like the idea -- it doesn't make sense to just have the water run off into my yard creating a rut; I'd rather put it to good use. Problem is, my ...
5
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2answers
81 views

Are motion activated faucets more sustainable than traditional faucets?

In the spirit of this question about paper towels vs electric dryers, which types of faucets are most sustainable? The marketing reasons for using motion-activated faucets are that they reduce water ...
2
votes
2answers
82 views

Are aluminum sheets appropriate for rainwater catchment roof?

I was thinking of building a rainwater catchment system at my place in the boonies, but ... I want to make sure -- priority one -- I'm not going to get toxic stuff in my water. I looked at the ...
3
votes
1answer
78 views

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

It is mind-boggling to me that there is still so much plastic out in our oceans, floating around for years and ever growing and nothing is being done about it. Governments should work together, ...
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0answers
21 views

water hardness or GH

My system is aquaponics,The water hardness of my system is over 21 (GH>21)=425, in your opinion, could this cause me sluggish plant growth and low fertility and plant destruction?And What is the ...
5
votes
1answer
97 views

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

What is the best - cost, minimising negative environmental impact, simple - way to process grey water outflow? I plan to build an off-grid cabin, I will be harvesting rainwater, using it in my sinks/...
4
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0answers
312 views

Ammoniacal Nitrogen (NH3-N) test and sources of ammonia in natural bodies of water

One parameter that's involved in water quality assessment is ammoniacal nitrogen (NH3-N), a measure of ammonia. Where does ammonia come from in natural water sources, such as a river? What factor ...
4
votes
1answer
91 views

Energy saving “bonus” for apartment renters

I live in an apartment building with three units, but only one gas meter, one electric meter, and one water meter. As a result, there is no inherent incentive to save water and energy, and no fair way ...
3
votes
1answer
133 views

Is it worth washing a plastic bag to reuse it?

As I ask myself the question and start thinking about it, I realise it might be obvious that it is worth it. But I thought I'd ask anyway as someone might have a nice analysis to share. The other day,...
3
votes
1answer
79 views

Solar water-pump working continuously

I want to install a solar water-pump or a windmill water pump to extract water from an aquifer without stop during the day (constant flow). The solar water-pump is less expensive and comes with the ...
5
votes
2answers
97 views

Is it environmentally sensible to clean a paint roller?

I'm currently decorating a room and conscious of how much water it's taking to clean the paint out of a paint roller. At what point does the environmental cost of cleaning exceed the environmental ...
6
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0answers
58 views

Calculating wheel and motor size for run-of-river hydroelectric generator [closed]

I am a student designing a hydro electric generator used on rivers to collect kinetic energy from horizontal water flow, rather than potential energy from vertical water drops. My idea is to turn a ...
6
votes
1answer
64 views

Toilet tank with both water main and waste water (underflow)

I'm looking to supply my toilet tank with rain water and grey water from, say, the washing machine, but if that's not enough water to fill up the tank, I want to use water from the water mains to top ...
6
votes
1answer
252 views

Are The Great Lakes Getting Cleaner or Worse?

I live in Hamilton Ontario which a major city right on the shore of Lake Ontario, and I was just doing some personal research on the pollution levels in lake Ontario. Generally the water here has a ...
5
votes
3answers
99 views

Does the world have a defined amount of water?

I was thinking the other day, after having a very wet winter season in New Zealand, if we are getting all this rain, are other parts of the planet, getting droughts? and of course this lead to the ...
4
votes
1answer
34 views

Reference request - Overview over established solar thermal desalination technologies

I'm looking for an overview of established solar thermal desalination technologies. The wiki page is remarkably poor on sources. "Established" means there is a large scale plant (>50 m³/d) or many ...
3
votes
1answer
365 views

Can pumped water energy storage be combined with rainwater harvesting?

A recent question on what to do with harvested rainwater got me thinking about pumped energy storage systems. Since both systems require storage of water for later use, is there a cost-effective way ...
4
votes
2answers
148 views

Why is there so much scarcity of water?

Today I heard on the radio that only 1 litre of water will be available per person by year 2090. If there is plenty of seawater present on our earth and there are processes like desalination and ...
5
votes
1answer
187 views

Need critique of my idea for a passive heating and cooling system for a tent/waterbed

The Idea A small thin waterbed mattress inside a tent cot that is filled with water that's heated by the sun during the day and cooled at night. The Details Get this tent cot and water mattress (...
20
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5answers
5k views

Why don't toilets use saltwater?

My question is in the header. It would seem to be a major environmental benefit if toilets used saltwater in stead of potable fresh water, right?
6
votes
1answer
40 views

How much water and energy does it take to produce canned jams in large/medium scale operations?

I'm canning my own cooked jams, and I'm estimating that I'm wasting half gallon (1.9 liter) of water per cup produced, for canning and dishwashing mostly. Not including the water and energy used to ...
4
votes
1answer
63 views

What are the power requirements for typical water desalinization devices?

I'm interested in marine desalinization. Most every device I have seen this far is some fossil-fuel driven high pressure pump. Are there electric ones? Is high pressure even that necessary to ...
8
votes
1answer
110 views

How to benefit from air-conditioning water

I'm doing research on the water of the air conditioning, and a dissertation on how it could be collected and where it could be used. I already started by collecting some figures and I did some ...
5
votes
1answer
63 views

Sizing a stormwater detention pond

I am building a small building on top of a hill. The roof area is 600 square feet. In my area, we get about 39 inches of rain each year, which amounts to 600*38/12 = 1950 cubic feet ~ 14500 gallons ...
6
votes
2answers
96 views

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

I am interested to know how large a solar panel one would need to produce pure oxygen and pure hydrogen from sea water. I already found the required energy here: If you assume perfect efficiency......
4
votes
4answers
117 views

Coffee substitute with less water use

I have heard estimates as high as 37 gallons (140 liters) of water used in the production in each cup of coffee. As someone who is an inveterate drinker of coffee for multiple reasons (caffeine, ...
5
votes
1answer
91 views

Are there different types of water-source heat pump?

I have heard multiple names for water-source heat pumps. What's the difference between something called a water-to-water heat pump, and a seawater heat pump? Are they just different names for the same ...
6
votes
1answer
123 views

Coffee grounds to water plants

So, I want to try recycling the water I use to rinse the coffee grounds out of my morning coffee. The thought is, a plant of some description on the (north facing) windowsil of my kitchen. The ...
5
votes
2answers
889 views

How good is it to reuse water from plant pots?

I'm living in an apartment, and after I water my plants the water goes to plates below the pots. The pots are in a metallic structure above the plates, so I can take the plates to reuse the water (...
5
votes
2answers
266 views

How can people afford to be self-sufficient and sustainable?

This is my first post so hello to everyone on here! One thing I constantly battle with is money and affording to be more self-sufficient. Don't get me wrong – I earn good money, I have managed ...
3
votes
1answer
353 views

Should I leave water in a water boiler for prolonged periods?

When I fill my electric water boiler with water some time before boiling it, the water gets warmer, it's temperature get closer to the room's temperature, saving some energy. On the other hand, I've ...
4
votes
1answer
67 views

Are there hard water purifiers for the main water pipe into an apartment?

The water supply in our apartment is hard water and is not suitable for daily use like washing clothes, drinking, bathing etc. Are there water purifiers we can put on the main water pipe which goes ...
7
votes
2answers
140 views

Whole-of-life impact of liquid soap vs solid bars of soap

My wife recently replaced the soap dish in our kitchen (and the soap on it) with a liquid soap dispenser. Within about a week, we've used about half the bottle of liquid soap, whereas solid bars of ...
3
votes
1answer
612 views

How much moisture is left on the walls and floors of a shower after use? Is it significant?

Our shower has 2 plastic walls and 3 (smaller) glass walls, and a plastic floor. My family prefers to squeegee it to remove at least the water from the glass so that minerals from the water don't ...
4
votes
2answers
868 views

Can you drink condensation water from air-con after treating it?

My question is about using condensed water from air conditioners. Can this water be treated with reverse osmosis plants and ultraviolet so you can use it? How pure will this water be? If this water ...
3
votes
5answers
15k views

What is the difference between “hydro” and “tidal/wave”? And what is the difference between “solar (heat)” and “solar panels”?

In the following graph: What is the difference between "hydro" and "tidal/wave"? And what is the difference between "solar (heat)" and "solar panels"?
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votes
5answers
1k views

Can real straw be used as a natural drinking straw?

I'm wondering if grass (or something else) straw was ever used for making drinking straws before plastic ones were made. My daughter loves having a straw in her drink but it irks me to have to throw ...
12
votes
5answers
1k views

Leak proof water bottles?

I'm trying to find a leak-proof reusable water bottle and have had a lot of difficulty with this task. So far, the best I've been able to do as far as strictly the leak-proof issue is a Nalgeen water ...
10
votes
4answers
1k views

How to conserve water while bathing?

This NASA article states that the ISS crew members will use 4 liters of water or less for bathing, in comparison to 50 liters which they claim is the average used by earth's citizens in developed ...
9
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2answers
174 views

Is it actually possible to have a global “water shortage”

Much has been made lately of the growing prospect "water shortages". The impression is given that we must all conserve, lest we run out of usable water. To my understanding, the planet earth is a "...
6
votes
2answers
158 views

Tea tree oil and water organisms

I've seen tea tree oil been advertized as powerful anti-fungal & anti-bacterial agent, which people seem to use for practically anything: laundry (in particular cloth diapers) room freshener ...
9
votes
2answers
224 views

How effective is free cooling

I live in the tropics, and during the summer it is very hot here. Today the air temp was low-mid 30C with 80% Relative Humidity. I live close to a stream, which I'd like to use for free-cooling. ...
5
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3answers
720 views

Dragonflies vs. mosquitoes [closed]

There is a small pond next to my house and I observed that dragonflies spawn there. Probably so do mosquitoes, at least the location in general is plagued by mosquitoes. Standing water is a suitable ...
4
votes
2answers
204 views

Is there a portable water recycling unit?

Is there a portable water recycling unit that one could install in their studio apartment to recycle grey water ? Or which is the smallest grey water recycling unit ? And can't someone just pass the ...
6
votes
4answers
297 views

What items can I reuse to make my own homemade rain barrel on the cheap?

I want to set up a rain barrel to collect water to use in my garden. Any ideas on how I can do this using only or mostly upcycled materials (cheaply)?
8
votes
1answer
881 views

What are the challenges for using carton boxes instead of plastic bottles for water?

Milk has come in carton boxes for ages, but water has not been available in cartons until very recently and only at limited locations. What are the pros and cons of using carton boxes for water ...
6
votes
2answers
1k views

Clamp-on water meter?

My region is experiencing a drought and I'd like to know how much water my household is using so we can be sure that we're minimizing our water use (which is good to do even in normal conditions). ...
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2answers
396 views

Can an enclosed Pelton Turbine be used as a pump?

Can an enclosed Pelton Turbine be used as a pump, perhaps through the centrifugal forces created in a enclosed Pelton Turbine when it rotates at speed? The water striking out of the buckets of a ...
5
votes
1answer
274 views

How does yerba mate stack up against tea and coffee?

Caffeine has a stimulating effect on the central nervous system - as most coffee drinkers will attest, it provides a boost to our productivity and creativity. It has also been associated with lower ...