I'm with Jan. It's PROBABLY safe, but...
I'd raise FC to 13-15 immediately using bleach and keep it there. I'm assuming your dot-test of CYA is correct and your strip isn't so you have little or no CYA. Either way 15ppm won't hurt your pool, but will kill algae faster.
You can get steam distilled water at your local supermarket or discount chain drug store. Dilute 1 part pool water with 2 parts distilled water and then measure. If you read "5" for chlorine, it means you have 15ppm. Search for the "CarlD Shotglass Method" here or at PoolSolutions.com (Ben's other site).
Now 1 gallon of 6% bleach will raise your FC by 13ppm. 1 quart will raise it by about 3-3.25ppm.
Run your filter 24/7, and clean the cartridge whenever the flow seems to lessen.
I'd check the water several times a day and add bleach when it drops below 15 since you are in a rush to get it cleaned up.
At this point, bleach is your best and safest bet.

Carl