What was found
DURING DESCENT FROM FL 330, TURNED ON ANTI-ICE, WINGS & ENGINE. AN ODOR SIMILAR TO A FOG MACHINE WAS DETECTED. MORE APPARENT AT LOW 20,000 FT RANGE & COULD SEE SMOKE IN CABIN. POWER SETTINGS AT IDLE OR 15 TO 20% ABOVE IDLE. ENVIRONMENTAL SMOKE KNOWN SOURCE CHECKLIST WAS RUN & CABIN PRESSURE SYS TURNED OFF. UNABLE TO DETERMINE LT OR RT BLEED AIR, STARTED WITH ANTI-ICE ON. CABIN SMOKE DECREASED ONCE PRESSURE SOURCE OFF. INSPECTED ACFT. DETERMINED ODOR CAME FROM BLEED SYS, RT ENGINE. INSPECTED ENG IAW EMM, DRAINED & SERVICED OIL, 2 QRTS & INSPECTED BLEED DUCTING & FOUND ODOR EMINATING FROM RT OZONE CONVERTER, & DEBRIS IN CONVERTER. R & R OZONE CONVERTER. OPS & LEAK CHECKED GOOD IAW AMM 21-70-05.