Fermenting like smell and watery honey in base cavity of Flow frames


This is in the flow frame collection trough?

I would recommend cleaning the trough thoroughly with a pipe brush and rinsing with warm water (make sure you have the flow tube in place to prevent leak back of water into the hive) and drying with a cloth wrapped around the end of your flow key. Make sure that you don’t shove the whole cloth into the tube or you may have to disassemble the flow frame to retrieve it!

There are also these thread about larvae in honey: