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GeneralRe: Why do people stock up on toilet paper in crisis situations ? Pin
Johnny J.12-Mar-20 22:52
professionalJohnny J.12-Mar-20 22:52 
GeneralRe: Why do people stock up on toilet paper in crisis situations ? Pin
Nelek13-Mar-20 15:03
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GeneralRe: Why do people stock up on toilet paper in crisis situations ? Pin
the goat in your machine12-Mar-20 22:18
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GeneralRe: Why do people stock up on toilet paper in crisis situations ? Pin
CodeWraith12-Mar-20 22:32
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GeneralRe: Why do people stock up on toilet paper in crisis situations ? Pin
OriginalGriff12-Mar-20 22:45
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GeneralRe: Why do people stock up on toilet paper in crisis situations ? Pin
Member 798912213-Mar-20 12:54
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GeneralRe: Why do people stock up on toilet paper in crisis situations ? Pin
OriginalGriff13-Mar-20 21:02
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GeneralRe: Why do people stock up on toilet paper in crisis situations ? Pin
Member 798912214-Mar-20 4:34
MemberMember 798912214-Mar-20 4:34 
Around here (Norway) some people install greywater heat recovery systems. (A single guy in a homeowners' web forum repeatedly suggests using water from the shower in the toilet, but he is ignored or turned down.) Heat recovery systems are simple - a buffer tank with a heat exchanger in the outlet. Even simpler: The outlet from shower cabinet heats the cold water supply to your shower mixer.

The ovations are rather subdued. Kitchen/dishwasher greywater is full of fats and other particles, clogging up the heat exchanger, and is nutrition for bacteria (and even rats) in the sewage system. (The fat will get to the sewage anyway, but if you cool it down first, it stiffens and sticks to any surface.) Cleaning the system is a task you will hate. As the article says, using the greywater in the toilet would require an expensive filter/desinfecting system.

Heat recovery is limited. The shower cabinet heat exchanger has no effect until you are halfway through your shower. It contributes only to the coldwater. Traditional Norwegian water heaters were electrical, keeping 200 liter of water at 90-95°C, so coldwater was 2/3 of the mix. Modern heaters are heat pump driven. For good performance, water is kept at 45°C, maybe 50°C (you must raise it to 70°C weekly to kill legionella). Coldwater is at most 10-15% of the mix. If you catch all the greywater, a lot of it is cold or maybe lukewarm. The mix is lukewarm at best, and really isn't useful as a heat supply for anything.

An heat pump hotwater issue: 180 l @ 45°C has less than half the capacity of 200 l @ 95°C. For a large family, it might be on the low side. I will remodel my house this spring, installing a heat pump, but rejected complete greywater heat recovery due to tne maintenance / cleaning issues. Shower / bathtub outlet alone is reasonably "clean", some soap but little fat, and reasonably warm. So I will keep shower greywater separate down to the basement room of the heat pump. A T-valve can either steer it to the sewage, or let it make a detour through my old, discarded 200 liter water heater. The coldwater intake to the heat pump heater will have a detour that is a long spiral tube inside the old tank, for being pre-heated by the shower greywater. When a lot of hot water is consumed, the preheating will help reducing the recovery time for the new heater, making it appear as a bigger tank. The connections to the old tank, both the "warm circuit" greywater and the "cold circuit" coldwater inlet, will be with snap-on couplings so that I can easily disconnect for cleaning - or for throwing it completely out if it turns out to be a bad idea.

I considered using shower greywater for summertime garden watering. That would require a pump, and I don't know if soaps could harm the plants. It would not be useful during water outage. So I went for a large rainwater cistern instead, independent of the water supply, is fairly clean, it helps avoiding that the soil in my garden is washed away during extreme rain showers, I will have five cubic meters of water for my garden during a draught...

For the sewage system: My city is in the process of a complete renewal of the sewage, where they will keep rain water (referred to as "surface water") out of the sewage. This will strongly reduce the sewage volume that has to be processed before letting it out in the sea. The surface water will be given a completely different treatment - where possible, by letting it seep into the ground as it would have done if there was no city here.
GeneralRe: Why do people stock up on toilet paper in crisis situations ? Pin
RugbyLeague12-Mar-20 23:07
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GeneralRe: Why do people stock up on toilet paper in crisis situations ? Pin
Eddy Vluggen13-Mar-20 1:07
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dandy7213-Mar-20 2:37
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GeneralRe: Why do people stock up on toilet paper in crisis situations ? Pin
Member 798912213-Mar-20 12:41
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GeneralRe: Why do people stock up on toilet paper in crisis situations ? Pin
dandy7214-Mar-20 2:28
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obermd13-Mar-20 8:48
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Member 798912213-Mar-20 12:31
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GeneralBitcoin: how's your investment doing? Pin
OriginalGriff12-Mar-20 21:12
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