If you can't vacuum to the filter, you might as well just
1. Raise your chlorine level above 10 ppm.
2. Run your filter 24/7.
3. Brush 3 or 4 times to stir it up.
4. Wait 24 hours to begin using the pool again. (Or, if your son is sick (upset stomach, diarrhea, vomiting), wait 48 hours!)
5. Keep chlorine above 10 ppm during that period.