is it something that you might be able to reduce by shocking the heck out of the water, run all jets, turbo, etc and make frothy on top of the tub, skim off, and reduce?
Seems most of the posts I've read (I'm a NEW-BIE) that have something to do with "crud" floating in the water, or otherwise being in the tub were recommended to do the shock, get all jets, etc working for awhile to loosen stuff up, skim or drain and refill.....