Click to expand Tap to zoom Growonix Replacement KDF X100,GX200, GX400, EX100, EX200, EX400 by Growonix Sold out $35.66 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Sold out KDF/CAT. Bacteriostatic media controls growth of microorganisms. Good for water soluble metals removal, chlorine, chloramine, and scale. Highly reactive catalytic carbon, extremely porous and long lasting.