Aqua Ultraviolet® Ultima II Filters with 3" Side-Mount Inlet/Outlet Sinking which means that they are

which means that they are electronically controllable

Internal re-circulation prevents overheating and ejects obstructing debris

How does nitrification work

(LPM) BHB-MD-225 ABS / PP EPDM 9" 25-80 BHB-MD-310 ABS / PP EPDM 12" 25-160

Uses a six-position control head

Aqua Ultraviolet® Ultima II Filters with 3" Side-Mount Inlet/Outlet Sinking which means that they areThe Ultima II Filter is the best choice for home hobbyists and aqua professionals alike due to its impressive capacity and minimal, effortless maintenance. Independent laboratory testing confirms that the Ultima II filter is superior to three leading bead filter brands in setup, nitrification, back washing and overall efficiency. It's perfectly designed for high flow rates, extreme fish loads and elevated feed rates. Why Use a Biomechanical Filter? To