Clear water with no odour and a clean and crisp taste earns higher marks.
But if you don't have the time to do your own testing, look for clear water.
Though the clear water might trick your brain into thinking you're in a sterile pool, you are not.
But don't expect a lot of clear water between the IMF and the chancellor at the end of it.
At the northern end of Whitehaven Beach, Hill Inlet is a spectacular, swirling melange of clear water and dazzling white sand.
There were moments when her unhappiness seemed as elemental as clear water.
Firefighters have used two high volume pumps to clear water from the A34 in Staffordshire which had been closed for two days due to flooding.
Its characteristic features are the landforms shaped by the Ice Age: glacial ridges, pine and lichen-clad heaths, kettle holes and small ponds filled with crystal clear water.
He sat now by the stream watching the clear water flowing between the rocks and, across the stream, he noticed there was a thick bed of watercress.
Silverio Sandolo backs the Sparviero out into clear water and sends the boat nosing past the sleeping mega-cruisers, trim yachts and other fishing boats not making the dawn run.
Unfortunately, if your kids are only looking for the next rollercoaster thrill, the Dream's Aquaduck, a 765-foot clear water slide that cantilevers 12 feet out over the ocean, will not match up.
Whether filming hippos in the clear water of Mzima Spring, flamingo chicks in a dried-out soda lake or the complex layers of life within a massive baobab tree, the Roots always let their subjects tell their own stories making astonishing discoveries along the way.
"The idea is that the same thing is true for colors, that there are certain kinds of colors that are characteristic of stuff that's good for us as a species -- clear sky, clear water -- and stuff that's bad for us, like rotting foods, biological waste products, " he said.
Gorges and karst plateaux feature 700 caves, hundreds of sinkholes, a 9-km-long thermal-water maze under a town and more than 1, 600 clear-water springs.
Thousands of tourists are drawn to Sharm for its sun, clear blue water, and coral reefs.
They also absorb pollutants that can cause algae blooms and help clear the water.
Mr Davis has a compass and it is pointing him out into clear blue water.
Farms are being disinfected and helicopters are spraying insecticide while ground workers clear stagnant water.
Both coalition partners feel the need to create some clear blue water between them by redefining what they stand for.
Hitherto in their lives they had seen themselves in looking glasses and hand mirrors, in the backs of spoons, and, dimly, in clear still water.
So, although this week has been about building bridges, there is still clear blue water between Europe and America on a number of important issues.
And he has resisted the delusion which would most surely condemn his party to eternal opposition, that of seeking clear blue water between himself and Mr Blair.
Unifi, for example, developed its own brand of yarn called REPREVE, which is made from industrial waste and clear plastic water bottles, and is used primarily by apparel manufacturers.
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However the government in Cardiff Bay has adopted a series of measures designed to put "clear red water" - to quote the former First Minister Rhodri Morgan - between Wales and Westminster.
Mr Hague has long seen this as the "clear blue water" between him and Tony Blair and there is some evidence that he is more in tune with public feeling than is the prime minister.
Of course, Mr Letwin and Mr Cameron, both old Etonians, may simply be attempting to put some clear blue water between themselves and the more populist - or wilfully philistine depending on your point of view - elements on Labour's front bench.
What brings me back is a collection of specifically New England sensations that I associate with the place: free-wheeling a bicycle down a sandy beach road, the tang of lemon on fried clams, the clear green water of the north Atlantic and the pure maritime light.
Unlike the exaggerated claims of so many Bush critics, the memos make clear that water was not actually expected to enter the detainee's lungs, and that measures were put in place to prevent complications if this did happen and to ensure that the individual did not develop respiratory distress.
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