| abstract |
A filter comprises a paper layer, at least one outer particle filtering layer adjacent the paper layer, an ion exchange layer adjacent the at least one outer particle filtering layer, at least one outer non-woven layer adjacent the ion exchange layer, at least one salt-tolerant superabsorbant polymer layer adjacent the at least one outer non-woven layer, an inner particle filtering layer adjacent the at least one salt-tolerant superabsorbant polymer layer, an inner non-woven layer adjacent the inner particle filtering layer, and a support adjacent the inner non-woven layer. n Alternatively, the filter comprises a paper layer, at least one outer particle filtering layer adjacent the paper layer, at least one salt-tolerant superabsorbant polymer layer adjacent the at least one outer particle filtering layer, an inner particle filtering layer adjacent the at least one salt-tolerant superabsorbant polymer layer, an inner non-woven layer adjacent the inner particle filtering layer, and a support adjacent the inner non-woven layer. |