You cant filter it out. you desalinate water through evaporating the water out of the salt.
you can have the water evaporate and it will leave the salt behind
Salt is not a filter, it is added to pool water to allow a chlorine generator to operate.
http://www.ehow.com/how_4477542_own-above-ground-pool-filter.html
salt in the water can be reomved by reverse osmosis. In reverse osmosis, solvent is flown from the solution