Question:
I saerch a internet adress of a salt-water-filter-dealer.The filter must be light and small.I need sweetwater and have only salt water.It is a great problem...!

Answer: There is no such thing as a "filter" to remove s Salt water can beconverted to pure drinking water with a reverse osmosis purification device(water maker), such as the ones commonly used in ships or big yachts. Theyuse electricity to force the water molecules through a special membrane,leaving the resulting brine behind to be flushed away. They are _not_ lightor small, they are quite expensive (at least $2000US), and use large amountsof electricity, but they are easy to find at any good marine supply. Theyare not portable - they must be plumbed into the water system and have areliable power source.

I have seen a "tabletop" reverse osmosis unit for home use (110 v ac) thatis slow, but does provide a few gallons a day. It was about $400US at alocal hardware store. It sat on display for over a year, not one was sold,and eventually it was sent back to the distributor as a lost cause. That wasprobably more because there is plenty of good fresh water available aroundhere than any other reason. In an area with bad or inadequate fresh water itmight be a good device. But you could buy a lot of bottled water for theprice.

There may be small lightweight distillation devices available, but I do nothave any personal knowledge of them.

What you end up with mainly depends on how much water per day you require.That will determine the size and cost of the unit.

I would recommend that you call or visit a large marine supply and talk tothe sales people there. They may have some small units. I too looked on theinternet and found nothing of much value.