No - Greywater is water that has already been used once such as showers, baths, cleaing clothes, washing up and dishwashers, but excluding toilets and any water used for cleaning waste which is classed as "black" water. Rain water is cleaner because it is fresh from the sky. Grey water system are similar to rainwater harvesting as they involve replacing fresh water with grey water for toilet flushing.
The largest part of a system is the reservoir. A larger store is better as it provides greater protection from dry days, but you could use a single 100 litre water butt which has a footprint of 35cm2 and a height of 1m.
If you have the garden for it, you could even have a large tank buried underground so as not to lose any space at ground level.
Our handy Storage tank calculator can be used to give you some idea of tank size required to meet your needs.
Every installation is different, but 3 days is a reasonable figure to start with. For example, 1 day to install the reservoir, 1 day for the header tank, pump and connecting this to the reservoir, and then 1 day for connecting the header tank to the various outlets.
Technically yes, but we advise against using rainwater for anything in connection with food and drink.
Most systems don't treat or filter the rain water so it is not safe to drink and therefore not recommended for use in
dishwashers.
The average person uses 150 litres of water per day (Source: Energy Saving Trust). Using harvested water for toilet flushing, washing machine and outdoor use could save 50%, so you could save 75 litres per person, per day.