A 7-stage Reverse Osmosis (RO) system builds on the standard 5-stage system by adding extra filters for enhanced water quality, typically including alkaline remineralization and UV sterilization. These additions aim to improve taste, pH balance, and microbiological safety.
Stage 1: Sediment Filter (5 Micron or Lower)
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Function: Removes dirt, sand, rust, and debris.
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Purpose: Protects and extends the life of the carbon filters and membrane.
Stage 2: Granular Activated Carbon (GAC) Filter
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Function: Removes chlorine, chloramine, VOCs, and chemicals.
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Purpose: Protects the RO membrane and improves taste/smell.
Stage 3: Carbon Block Filter
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Function: Further refines chemical filtration.
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Purpose: Ensures maximum chlorine and contaminant removal before the RO membrane.
Stage 4: RO Membrane
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Function: Removes up to 95–99% of dissolved solids, including:
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Heavy metals (lead, arsenic, chromium)
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Fluoride
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Nitrates/nitrites
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Bacteria and viruses
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Core stage of purification.
Stage 5: Post Carbon Filter (T33 or Polishing Filter)
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Function: Removes any residual taste/odor after water is stored in the RO tank.
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Purpose: Final taste enhancement.
Stage 6: Alkaline Remineralization Filter
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Function: Adds beneficial minerals like calcium, magnesium, potassium.
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Purpose:
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Improves taste and mouthfeel.
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Raises pH (alkalizes the water).
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Counteracts the “flat” taste of pure RO water.
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Stage 7: UV Sterilization Light
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Function: Uses ultraviolet light to kill bacteria, viruses, and other microbes.
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Purpose: Provides biological protection, especially important for:
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Well water
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Areas with boil-water advisories
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Travelers or off-grid homes
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