Commercial Pool and Spa Supplies
FILTER MEDIA, AFM, DR DRYDEN'S AFM GRADE 3 55lbs
FILTER MEDIA, AFM, DR DRYDEN'S AFM GRADE 3 55lbs
SKU:DDAFM-1
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The Dr. Dryden's AFM (Activated Filter Media) Grade 3 (55 lb / 25 kg Bag) is an advanced, bio-resistant, self-sterilizing granular filter media engineered specifically to serve as an underbed support layer in commercial and residential pressurized glass/sand filters. Manufactured exclusively from selected, post-consumer green and brown container glass by Dryden Aqua, AFM undergoes a patented three-stage activation process that renders the material 100% bio-resistant—preventing the formation of bacterial biofilm, eliminating bio-fouling, and suppressing the conversion of urea into trichloramines and THMs.
Grade 3 functions as the coarse foundational layer positioned directly over the filter laterals or nozzle plate. It replaces traditional 1/8" to 1/4" pea gravel to prevent fine media migration into the lateral slots, ensure uniform hydraulic flow across the bed cross-section during filtration, and provide balanced water and air distribution during backwash cycles.
| Parameter | Specification |
| Trade Name / Classification | Dr. Dryden’s AFM® (Activated Filter Media) – Grade 3 |
| Nominal Packaging Weight | 55.0 lbs (25.0 kg) per bag |
| Material Base | 100% Upcycled Green and Brown Container Glass |
| Activation Process | Chemically and thermally activated; permanently negative surface catalytic charge |
| Grain Grade / Sizing | Grade 3: 2.0 mm to 4.0 mm |
| Particle Shape | Sub-angular, non-porous, calibrated grains with smoothed safety edges (no sharp splinters) |
| Bulk Loose Density | Approx. 78 lbs/cu. ft. (1,250 kg/m³) – ~15% lighter than standard silica sand/gravel |
| Specific Gravity | 2.50 |
| Certifications | NSF/ANSI 50 (Pools & Water Parks), NSF/ANSI 61 (Drinking Water), ISO 9001:2015 |
| Chemical Resistance | Immune to biological degradation, chlorine/bromine oxidation, and ozone |
| Bed Placement | Primary bottom underbed layer (placed directly over laterals/nozzle array) |
| Packaging Material | Heavy-duty, UV-stabilized heavy-gauge plastic bag with moisture-sealed seams |
Because AFM has a lower bulk density than standard siliceous media (approx. 78 lbs/cu. ft. vs. 100 lbs/cu. ft. for pea gravel), approximately 15% less media by weight is needed to fill the equivalent volumetric bed depth. The shipping weight of a single bag is 55.0 to 55.5 lbs (25.0 to 25.2 kg). For freight logistics, it is packaged in standard configurations of 40 bags per pallet (2,200 lbs / 1,000 kg net), stretch-wrapped with corner boards and weather-resistant protective sheeting.
