My answers are blunt and may be abrasive to some but my goal is to give you the best answer I have.

It is very lite and fluffy,,harmless to pets and humans,even rated as food grade edible.It is abrasive to insects only, scratchs there endoskin and causes them to dehydrate.

When I started pointing out conversations (I take good notes) when I was told otherwise the lady got abrasive and refused to help me.My question is, has this happened to anyone, what are some of the reason that a payment would increase by this much?

FYI I did finally bite the bullet and pay to see a lawyer who specializes in this (I had such a bad experience with an abrasive, unhelpful lawyer that I went to a couple of years ago that I had almost sworn them off for good).

One person in particular was very rude and abrasive, but said they might be able to pay. 

I would be reluctant to put it out there to a demanding client though.I read your post a number of days back and didn’t respond because I felt like my response would be seen as abrasive which is not what I intended it to be.

PO told him not to use abrasive cleaners on the tub. 

Your word choice is very abrasive and off putting.

Here's a linked folder with images detailing the issue.In short there appears to be dirty, abrasive spots forming at the seams of where adjoining tiles meet.

You can also get an abrasive cleaning stick that will help you get a bit more life out of each belt, but that really only comes into its own at the finer grits, like 80 and 100-grit.This is how I typically avoid renting drum sanders for mid-sized surface sanding projects.