Note: Media that comes with Ultima II filters is in 12lb boxes, so replacing with Ultra Bio-Media should be done by total weight, not number of boxes
Ultra Bio-Media for the Aqua Ultraviolet® Ultima II Filter is a patented, non-wax-based plastic media that comes pre-seeded with natural bacteria so that it starts working within 2-4 weeks of installation, instead of industry standard 6 weeks! Its unique tubular design prevents clumping and gives it the highest surface area of any product on the market, which allows the Ultima II to handle more load even though it is smaller than bead filters. When it comes to cleaning, this media allows for easy separation of waste while protecting the beneficial bacteria.
Each cubic foot of Ultra Bio-Media has 750 square feet of surface area
Highly effective, yet backwashes easily without clumping