Ultrapure

ultrapure water

Source: wiktionary

To quote Doctor Taylor further: "Certainly the laboratory and the factory which have cheapened food by canning and preserving it and the well-meaning legislator who has purified it, in some cases, perhaps, to the exclusion of the vitamines, owe to the public the corrective for machine-made, ultrapure and deceptive products."

Source: wiktionary

We will see on the other hand that when the symbiotic association has continued for a long time it may be very difficult to obtain ultrapure colonies. In this last case it is necessary to adopt special methods of isolation.

Source: wiktionary

The very high cost of ultrapure semiconductor silicon has been a barrier to lowering the cost of solar cells. Metallurgical-grade silicon has a purity as high as 99 percent, and it costs 10 to 20 cents per pound, roughly the same cost as steel. The semiconductor-grade silicon, used In solar cells, however, has a purity of 99.99999 percent and costs $10 to $20 a pound.

Source: wiktionary