With a 15' Intex, draining is a good option if it's not too expensive.

However you need to remember that water mold, or other heavy biofilms are likely throughout your pool, and won't be gone, once you drain and refill. So:

1. Clean the cartridge and cartridge filter case carefully. If you are using Intex cartridges which are supposed to be discarded, this would be a good time to purchase a pair of Unicel replacements. The Super Simple Recipe page covers the details: http://pool9.net/ssr/

2. Chlorinating while you fill can be tricky -- you won't have stabilizer in the water, and the volume is constantly changing. An alternative is to dump an overdose of polyquat into the water. Unlike chlorine or other algae chemicals, an overdose of polyquat is not a problem: http://pool9.net/polyquat/

3. Once you have the pool operating, keep the chlorine HIGH. If you have a K2006, maintain a chlorine level that is 20% of your CYA level for at least 2 weeks after you see no trace of the water mold. (IE, if your CYA is 20, your FC should be 4; CYA=50 => FC= 10 ppm)