I have Biomax in my middle and bottom media basket in my FX5. It says to replace the biomax every 6 months, which I think it will last longer. Instead of purchasing new biomax do you think one could just remove one tray, boil them to clense them of all the gunk, place them in a cooler bucket with dechlorinator and re use. I think they would be just like brand new ones. Also you still have your other bucket full of biomax full of good bacteria.