If you don't get chlorine in it, it will grow algea. It will be very hard to clean up the water with an Intex pump.

Put in a gallon of 6% bleach. Right away. - Today. Buy a few gallons to be ready. mix it with a paddle, brush or skimmer.
Do you have a drops based test kit? Get an OTO based test kit right away - Today, pool store, walmart, home depot wherever.
Hook up the pump and filter.
You will have to add bleach often as the sun will consume the unstabilized chlorine very quickly.
Test and dose chlorine a few times daily as the sun is shining.

Order a K-2006 - it you order through the links in Ben's or some of the other mods sigs, Pool Forum wil get a few scheckels.

Greenish? As you filled it looked greensish or it became greenish in the couple days since you filled?
I believe the Intex salt water chlorine generators have a copper ionizer component - copper will stain the pool, blonde hair and fingernails green. you may want to reconsider using this device.


Others will chime in with more advise.