Chlorine causes it precipitate almost immediately but I wasn't aware the PH had anything to do with it. If you want to see a neat system I put together, copying from the clarifier in Small Scale Aquaculture by Steven Van Gorder, to produce gin clear mostly iron free water in 24 hrs., see my article on the RAS. No chemicals involved.
Last edited by Cecil Baird1; 07/20/10 07:54 PM.
