What was found
FLT 1103, BDL-RSW. DECENDING THROUGH APPROXAMETLY 5-8 K FEET A STRONG ODOR CAME INTO THE FLIGHT DECK. I ATTEMPTED TO ISOLATE WITH TURNING PACK 2 OFF WHICH WAS UNSUCCESFUL CABIN CREW CALLED UP AROUND 4K FT AND NOTIFIED ODOR WAS IN THE CABIN PILOTS DONNED ON MASKS AND LANDED WHILE ODOR CONTINUED ALL THE WAY TO THE GATE UNTIL ENGINE SHUTDOWN. 2 FA'S COMPLAINED OF HEADACHE AND NAUSEA PILOTS SYMPTOMS OF LIGHTHEADED AND DIZZYNESS; COMPLIED WITH INFORMATION NOTICE 2017-T015, STEP 1, ISOLATED TO TYPE 1 PER TSM 05-50-00-810-085-B / TSM 05-50-00-810-085-D FROM AMBIANT AIR/MOISTURE DURING PHASE OF FLIGHT. NO HISTORY WITHING 30 DAYS. NO ODOR FROM PACKS AIRCRAFT IS OK FOR SERVICE.