down to 1ppm already,Thats good news.
Well i tested my phostphate again. after adding 1L of salifert po4 remover.
Using my colormeter i got a surprise, had to test twice. it read .35ppm up from .19ppm. so after using po4 remover for two days it went up.
I think there is a problem with the meter as retested with deltec test kit and salifert, both read about .092ppm, which is low, bloody meter.