Raw Water Check Inputs

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Parameter                                            Sand Filter                                            DMI65 Media

Iron:                                   90–97% removal (<0.3–0.5 mg/L)            >98–99% removal (<0.01 mg/L)

Manganese:                    20–60% removal (≈0.25–0.5 mg/L)           90–99% removal (<0.05 mg/L)

Arsenic:                            0–50% (only with natural Fe flocs)       >90% (with Fe dosing to <0.005 mg/L)

TSS:                                       85–95% (effluent ~1–2 mg/L)                    90–99% (effluent <1 mg/L)

Turbidity:                           80–95% (effluent ~0.5–1 NTU)                  90–99% (effluent <0.5 NTU)

TDS:                                                        ~0%                                                                     ~0%

pH:                                                 n/a (no change)                                               n/a (no change)

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Iron:

A well run sand bed with pre oxidation (aeration or chlorine) strips out most Fe²⁺, but you’ll often see 0.3–0.5 mg/L left. DMI65’s MnO₂ coating supercharges iron oxidation and filtration, routinely polishing down to the ppb level without sacrificing flow rate.

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Manganese:

Sand’s slow on Mn²⁺ unless you boost pH above 8 or add strong oxidants—so you’re lucky to get 20–60% in one pass. DMI65 flips that around: its catalytic sites oxidize and trap Mn quickly, hitting <0.05 mg/L under neutral to slightly alkaline pH.

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Arsenic:

Neither plain sand nor DMI65 grabs dissolved As on its own—you need iron to co precipitate it. Sand will only remove As if there’s enough Fe floc; with DMI65 you get the same trick but more consistently, cutting As to single digit µg/L when you dose a small ferric coagulant.

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TSS:

Both are solid depth filters—sand pulls out 85–95% of particles, DMI65 nudges that up to 90–99% thanks to a tighter grain gradation. Result: sand might leave ~1–2 mg/L TSS, while DMI 65 often gets you under 1 mg/L before backwash.

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Turbidity:

Closely tied to TSS. A clean sand filter will usually hit <1 NTU; DMI65 can go even lower (<0.5 NTU, sometimes ~0.1 NTU) because it catches the tiniest colloids and metal precipitates that sneak past sand.

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TDS:

Neither filter touches truly dissolved salts—if you need hardness, chloride or other ions down, you’re into RO or ion exchange territory. Any TDS drop you see is just the few mg/L of metals that got oxidized and removed.

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pH:

No buffering or acid neutralizing in either medium. Their performance hinges on pH: aim for ~7–7.5 for iron, and closer to 8 if Mn is your worry. Otherwise pH before and after stays essentially the same.

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