Thanks to another tip from our Local Mom's site, I decided to try a Natural Drain Cleaner for my Bath Tub...
Pour in 1/2 cup baking soda, followed by 1/2 cup Vinegar.... fizz fizz fizz
After a couple minutes, pour in 2 Qts of Boiling water.... fizz fizz, super fizz
Shish Bam Boom - no more standing shower water in the tub.