If it is a sand filter and it came with the pool, I'm pretty sure the pump is part of the package. As far as I can tell, ALL Intex SWCGs include a copper ionization "feature". Copper in the water makes blond hair green.

This is the Intex sand filter page
http://www.intexcorp.com/index.php/h...ter-pumps.html
If your unit looks similar to one of these, the pump is included.