Commercial Pool and Spa Supplies
FILTER MEDIA, AFM, DR DRYDEN'S AFM GRADE 2 55lbs
FILTER MEDIA, AFM, DR DRYDEN'S AFM GRADE 2 55lbs
SKU:DDAFM-2
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The Dr. Dryden's AFM (Activated Filter Media) Grade 2 (55 lb / 25 kg Bag) is an advanced, bio-resistant, self-sterilizing granular filter media engineered to serve as an intermediate transition and secondary filtration layer in commercial and residential pressurized glass/sand filters. Manufactured exclusively from selected, upcycled green and brown container glass by Dryden Aqua, AFM undergoes a patented three-stage activation process that imparts a permanent negative surface catalytic charge. This renders the material 100% bio-resistant, preventing bacterial colonization and biofilm formation, eliminating media clumping/channeling, and substantially reducing the formation of harmful trichloramines and disinfection by-products (DBPs).
Grade 2 serves as the mid-bed grading layer, positioned directly between the coarse Grade 3 underbed (or the bottom laterals in smaller filters) and the fine Grade 1 top polishing layer. It prevents the fine Grade 1 media from migrating into the coarser underbed while establishing a graduated depth-filtration gradient that expands particulate holding capacity and ensures balanced hydraulic dispersion during backwash cycles.
| Parameter | Specification |
| Trade Name / Classification | Dr. Dryden’s AFM® (Activated Filter Media) – Grade 2 |
| 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 2: 0.7 mm to 2.0 mm (700 to 2,000 microns) |
| 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 #20 silica sand |
| Specific Gravity | 2.50 |
| Certifications | NSF/ANSI 50 (Aquatic Facilities), NSF/ANSI 61 (Drinking Water), ISO 9001:2015 |
| Chemical Resistance | Immune to biological degradation, chlorine/bromine oxidation, and ozone |
| Typical Bed Layering | Intermediate/support layer (commonly 15%–20% of total bed depth in multi-grade beds, or 50% in standard two-grade arrangements) |
| Packaging Material | Heavy-duty, UV-stabilized heavy-gauge plastic bag with moisture-sealed seams |
Due to AFM's lower bulk density compared to quartz sand (approx. 78 lbs/cu. ft. vs. 100 lbs/cu. ft.), approximately 15% less media by weight is required to achieve the equivalent volumetric depth in the filter vessel. The shipping weight of a single bag is 55.0 to 55.5 lbs (25.0 to 25.2 kg) gross. For bulk commercial shipments, it is standardly configured at 40 bags per pallet (2,200 lbs / 1,000 kg net), palletized, stretch-wrapped, and capped with weather-resistant protective sheeting.
