they got as high as .15ppm. Thru various methods I would get them down to the .06 - .08 range but never any lower. Again I dont want anyone to think that I am bashing pukani rock. While I believe it was the source of my problem, I also believe that I was the cause. Part of the reason I gave up on the rocks was because I was getting pressure from the powers that be (wife) to get rid of them and try something different. She has grown tired of my stress level over the tank. Her feeling was/is, if its not working get rif of it and find something that will. I do recall her saying that in reference to me from time to time....:rollface:
I am sure that the people that bought the pukani from me will be more successful at ridding the rocks of po4 than I was. They both have a lot of time before their new tanks will be ready so the rocks will cure for several months before they will put them to use.