Has anyone had any experience using this product? If so what do you think? How fast acting is it? I am currently dosig no pox had an issue with my nitrates stuck at 65ppm so i have changed 300litres in the last week. Got it around 15ppm but now its slowly creeping back up to 20ppm dosing 9ml of nopox. For some reason it just doesn't seem to want to work for me.
