It depends on the rules and laws of your local government as to whether gray water is allowed to be used.
Check with your local government about the use of "gray water." You would only use the rinse water, not that with soap.
Water will thin out laundry softener.
In wad=shing laundry, you use aproximittly 592.8 gallons of water each minute.
Most laundry detergents work just as well with cold water. By using cold water you will save money and reduce environmental damage. It depends.If you are putting laundry in the washer then use hot water.If you are washing laundry that stains its colour or just washing by hand then use cold water.
yes, I use it all the time and it is just fine
Depends on the plant. But things like crabgrass and weeds can grow in abundant sources of water with just about anything short of poison in it. It's no the fact that the water is dirty or has laundry soap in it, it's the fact that the water source is abundant and regular. A more sensitive plant might be killed by laundry detergent. If you want to use compost as fertilizer i.e. those dirty underwear, go right ahead!
Laundry
For laundry when dealing with scabies, it is recommended to use hot water and a regular laundry detergent. Make sure to wash all bedding, towels, and clothing worn in the past few days in hot water to kill any mites. Avoid using specialized scabies treatments on laundry, as they may not be effective or necessary.
Too many variables to give a good answer. By hand? How much laundry? Front load machine? etc.
10 to 20 litres a day
I use laundry detergent, water, and a washing machine to wash my clothes.
To effectively use a magnet laundry system, place the magnets in the washing machine to help soften water and reduce detergent needed. This can simplify your laundry routine by saving time and money, while also being environmentally friendly.