K2.5 XL Cz2.5 Filter Media PREMIUM GRADE Moving Bed Biofilm Reactor (MBBR) Fresh, Virgin, NOT Recycled. Creates Most Robust Good for Aquaponics • Aquaculture • Ponds • Aquariums (1 Gallon)

Its amazing how much better these work than my fill and drain beds alone. I bought them for an isolated system that feeds my in-ground corn and doesn't have a fill and drain bed system attached. I put in the same ingredients but the system with these things obviously works way better.I plan to add a small bio reactor tank with these in it to all my systems.They are relatively expensive though.

The filter media appears to be working beautifully. I am using the media in a pond in a greenhouse with Koi and the water is very clear.

Fast shipping. These work great for water polishing. I only received 1/2 gallon though...

Very good seller thanks A+++++

Just what I needed and good price.