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Screen filters are generally made of a (metal) mesh of some sort, their filtration grade is course, collecting large particles, typically a few millimetres (sometime perhaps 1/10th of a mm) in size or greater. Whilst paper filters are normally based on paper fibres combined together to form a very fine filter material, capable of filtering particles that are sub-micron (less than a 1/1000th of a mm) in size. Most HEPA filters for example are paper-based filters.
Everpure water filters do not work as well as the other main brands plus the filters are more expensive. Everpure uses reverse osmosis which takes even the good minerals which leaves the water tasting flat.
Yes, Robert Dyas sells water filters. They have a website and you may order online.
If the kidney filters 125ml of blood per minute, then you simply have to multiply 125 x 60 to find the answer of how much it filters in an hour. The answer is 7,500ml of blood.
Screen filters and paper filters are alike