Our toilets and sewage treatment systems deal with more than our own waste. In our efforts to create a hygienic domestic environment, we're often killing  more than just the bacterial nasties. Here's some tips for a greener loo that will save you a stack of cash as well.

Rain water is one of our greatest wasted resources - an average sized house without a rainwater tank misses out on harvesting tens of thousands of gallons of the precious liquid each year. If you're considering installing a rainwater tank, some points for consideration in regard to materials used in tank construction.