The low-flo toilets may require more cleaning just because of their design.As I can see from this thread and from the LL response. I am having lots of trouble showing that it is the toilet and NOT my cleaning habits. First I AM a very very clean fanatic. My apartment is one of the cleanest here. My sister always commented on that I was always so thorough in my cleaning of my dwelling. I have NEVER ever had a problem like this before. Also the older toilet that was in this apartment NEVER had this issue. I always kept the older one cleaned as well. It developed a leak at the floor flange and was replaced 5 months AFTER I moved in. THEN the problem arose. So since I had NO trouble with the older toilet and then it was replaced and now I have an issue. NOTHING CHANGED OTHER THAN THE TOILET. I did not change. My cleaning did not change. The water did not change. Just the new toilet !
Thank you again Quincy for your helpful post.
That actually answers the question. I must buy the test and then somehow show that the toilet is the issue. Again, that seems to be an uphill battle.
Discover first if it is mold that has taken up residence in your toilet and if it requires special treatment, and follow up with the landlord after that.