There are 2.5 gallon ziplocs suitable for filament.  Not sure what else they're suitable for.  If only China shipped filament in reusable bags instead of their disposable bags.  Just stuff the dessicant in the hole.  As soon as the next roll was put in the dehydrator, the pump went back on & the dew point went up.  

The dry filament once again printed without voids & it didn't cost a fortune in heating.

It was no longer straight.

Enough water leaked in by day 8 to briefly turn on the pump, but as soon as the container was opened, it went back on full time.  It was good evidence of the advantage of actively controlled ventilation over a passive system.  There should be a control study without filament to see how much measurement error is turning on the pump.

The only permanent indication that the filament is dry is the pump not turning on for a whole day.  It should be integrated in the apartment router to show a status page.