Been battling a good level of phosphate. my ultra low range was reading at about 0.1 ppm a few weeks back, so I decided to do a water change and start my phosban reactor with rowa. To my surprise, the reading went down for about a day and shot right back up. I was scratching my head thinking WTF. The following week and a half, I did 2 more water changes and triple the amount of rowa media, finally got a handle on it. last test was 0.022 and I'll do more testing to make sure I stay on top of it.
You know you are in trouble when your meter reaches the max number...
I am just kidding, that's not the highest it goes up to but still bad.