Wood duck help

Hello all! I'm raising a wood duck and was wondering if any of you let wood ducks out of their run during the day? I let mine out, he Flys off most of the day and comes back home before dark. Is this normal? Will he/she always do this? Not sure yet if it's female or male but I hope it's a drake! I've noticed a little red on its beak so maybe it is. Also wondering what is the best way to keep his/her pool clean? I currently only have a kiddy pool for the duck to play in and I'm having to clean it every other day. I've added a pvc pipe with a drain on the pool but it doesn't work all that well. Also what do yall feed your wood ducks? I currently only feed it game starter feed and lettuce. Any tips will be much appreciated! Thanks