There is a test that can be done for pseudomonas according to this site: http://www.watersafetestkits.com/html/poolkits.asp

Google "Pseudomonas aeruginosa in pool water" to find out more about the bacteria. In one of the .gov threads I read that a study showed that nearly 60% of pools across the US has Pseudomonas, I believe it was a study mostly for public pools. That percentage (if true) tells you how many pools aren't properly sanitized.

The reason the guys asked for the numbers is that in my case for example - I thought everything was cool, water was sparkling and my FC, TA and PH where "fantastic"...what I didn't know was due to my extremely high CYA of 230...my perfect FC of 2ppm was basically doing nothing. Now I learned from here that my FC should be at least 8ppm. I'm taking my "test dip" this weekend...if I don't get a rash...and don't disintegrate from the FC...I'm good to go