The Proven Solution: Catalytic Filtration with DMI-65 DMI-65 is an Australian-engineered, silica-sand-based catalytic media infused with proprietary oxidation sites. Unlike manganese greensand, it does not need potassium permanganate regeneration, making operation safer and simpler aquacorp.com.au . A small dose of sodium hypochlorite (household chlorine) is enough to keep the surface active, giving up to 5–10 years of continuous performance with minimal attrition waterequip.com.au dmi65.com . Performance highlights Removes iron and manganese to < 0.001 mg/L, protecting downstream RO membranes and distribution lines dmi65.com . High linear velocities—up to 30 m³ m⁻² h⁻¹, roughly twice that of conventional media, so filters are smaller and capex drops waterequip.com.au . Wide pH window (5.8 – 8.6) with best results around neutral pH—ideal for most Indian bore- and surface-water chemistries waterequip.com.au . Certified to NSF/ANSI 61 and UK Regulation 31, making it potable-water safe dmi65.com . Technical Specifications at a Glance Appearance: Brown–black spherical grains Particle size: 20 – 40 mesh (0.3 – 0.6 mm effective) Bulk density: 91 lb ft⁻³ (≈ 1.46 t m⁻³) Specific gravity: 2.69 Uniformity coefficient (UC): 1.4 Service flow: 5 – 30 m³ m⁻² h⁻¹ Back-wash flow: 25 – 40 m³ m⁻² h⁻¹ (20 – 50 % bed expansion) Min. bed depth: 600 mm (24 in) Operating pH: 5.8 – 8.6 (optimal 7 – 7.5) Max. water temp.: 45 °C Expected life: 5-10 years with < 5 % annual attrition
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