We researched gray water systems extensively and found Nubian to be the best for us. In terms of other systems I've encountered, this is the best I've experienced! No chemicals at all!!!! It filters the water twice and uses UV as a final cleaning stage. We recycle all water from showers, washing basins, bath and washing machine and recycle back to our toilets, an outdoor sink and a garden tap. It can be used on the garden, the dogs drink it, it's actually cleaner than tap water, just legislation says that people can't drink it. The system sits in our car port, it's large, but not huge. I'm amazed at what it does for it's size, it's very clever technology. I've heard that some people have complained about the noise level. We have it close to our bedroom and frankly I find the bubbling sound rather soothing, in fact the one time it stopped working it was the silence that woke me up! It's the pump to the toilet that causes noise. We've had a few teething problems with it. Each time easily solved and the service fellows don't mind you standing around watching and asking questions as they work. At one point, Michael from Sydney came down to see what was going on with our machine and it turned out to be a very sticky soap I was using to wash the dogs. Easily solved once we found out! The service is friendly, they are reasonably prompt, but call back to make sure if everything is fine. We even received a phone call during the bushfires to see if we were all right! A great system, yes it's expensive upfront and there are ongoing service fees, but in 12mths it has already saved us a lot!!! The people we have dealt with and who come out to service the unit are all great people. I cannot say enough good about this company. They know they have a good product and they are proud of it and stand by it.