Big plants， green grass and heavy harvests are often a result of one thing： water． If you are wondering why your plants in your garden are half the size of your neighbors ， I can guarantee they have a hidden soaker hosepipe （渗水管）somewhere or they have the time to water the garden as if it were a full-time job．
However， this summer is a hot reminder that climate requires water must be used wisely and justly． The hosepipe bans in north-west England and Northern Ireland are a relevant reminder．
However， there is no getting around it： when it doesn't rain， you do need to add water． Fixing an electronic system that can be turned on overnight may not be cheap， but it is efficient． Watering in full sun is guilty； the plant will become needy from the unnatural conditions， and you're wasting water： much will be lost in the sun． Sunshine in the day followed by water at night is a plant's idea of heaven， and you can create that with a soaker hose． It has many small holes so you can bury it just below the surface of the soil to hide it or a drip irrigation system， which allows water to drip slowly to the roots of the plants at certain points along a pipe． There are many setups， from professionally installed versions to ones you do yourself from companies such as Hozelock．
A cheaper solution is to create a grey water system which uses your waste household water． This is dependent on how clean your dirty water is； fat， detergents（洗涤剂）and solids are not ideal． The waste water in the washing machine， washing up bowl or bath water tends to be the cleanest． Softened tap water and dishwasher water are problematic because of the amount of salt used．
Bath water can be used directly on plants and trees， as long as you don't have too much perfumed soap or shampoo． Don't use it on food crops that you eat raw such as salads； there will be too much unwanted bacteria for that． The bath should cool before you use it， nor should you store grey water for more than 24 hours． For the short term， bath water out of the bath； longer term， investing in a siphon pump kit （虹吸泵组件）will make life far easier．



According to the author， ______ ．

A. a soaker hose is a must in the garden
B. night is the right time for watering plants
C. plants need watering when the sun is strong
D. the hosepipe bans make little difference in saving water

What does "grey water" in the passage probably refer to？ ______

A. Waste water from the home．
B. Clean water without fat．
C. Bath water out of bath．
D. Tap water with salt．

What is the passage mainly about？ ______

A. A new kind of pump．
B. The value of waste water．
C. Some water saving methods．
D. The use of hosepipes．