Trick I found in work. If you want to filter water for limescale with a carbon filter (like a Brita) and it doesn't guarantee to remove it all, put the water back through a few times.
I got this advice from someone who worked for the company who supplied our tow truck and forklift batteries, as the filters go 'off' they don't lose all their filtering properties.
The ones we have in work supplied for topping up the batteries can filter efficiently at mains water pressure, but when they 'fail' this guy was taking them home to filter his water from a spring by gravity feed and it was still coming out clean. He said the carbon canister has to filter at the given flow rate, but if you slow it down (or repeat the filtering) it will still work for a long while after it 'broke'
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