I have a 9x48 mineral tank with a fleck 5600 & am going to rebed the carbon & gravel it's been 4 + years since last rebed & starting to get breakthrough of chlorine. I have just read that my gravel size should be based on my max gpm use ? My max usage flow is around 12 gpm but thats on a rare occasion. Have been looking online & there seems to be several different types & sizes available. Any help greatly appreciated.
V/R Dwayne
V/R Dwayne