I believe that this combo system may be the only one available large enough for your 24x12:
Intex 2800GPH pump + filter + salt-chlorine system
I assume you are talking about this 12x24 pool, as an upgrade, and not a 25x12:
Intex 12 x 24 Ultra pool
Manuals and specs can be found here: http://www.intexcorp.com/index.php/manual-video