Lighthouse Filters LLC

- Continuous Downflow Sand Filter


A unique patented design that features multigrade filtration to remove suspended solid contaminants. For use in water & waste water treatment. The VOLCANO SAND FILTER is a continuously, backwashing filter which eliminates the need to shut down for back wash like conventional sand filters. Feed water containing contaminants flows downward through the coarse, intermediate, and fine sand media. The contaminants are captured. The purified water leaves the filter as filtrate. The air lift continuously transports the sand with contaminants to the wash box. In the wash box, the contaminants separate from the sand and are removed in the reject stream. The cleaned sand falls back to the sand bed and classifies into coarse, intermediate and fine media layers. The process is continuous.

  • Continuously Cleaned Sand Bed
  • Low Pressure Drop
  • No Moving Parts
  • Downflow Design
  • Multi Grade Sand
  • Low Operator Attention

  • Non-stop operation. Simple process. Constant filtrate quality. No dead zones or mudball formation.
  • No pump required. Gravity feed capability. Low power consumption Low cost.
  • No mechanical indexing of chambers. Low maintenance. Low cost.
  • Assures high quality filtrate. No bed expansion or short circuits as in upflow designs.
  • Allows high loading rates while maintaining fine filtration.
  • Low operating cost. Low maintenance. Remote monitor available.

  • Pilot Demonstration Equipment
  • Lab Testing
  • Engineered Systems
  • Field Service


  • Water Reuse
  • Waste Water Treatment
  • Metal Hydroxide Removal
  • Wet Scrubbers & Cooling Towers
  • Textiles
  • Food & Beverage
  • Power
  • Pulp & Paper
  • Oil & Chemical Plants
  • Pure Water

Ground & Surface

  • Remediation
  • Algae
  • Well Water
  • River/Pond Intake
  • Lagoons
  • Leachates


  • Water Reuse
  • Tertiary Filtration
  • BOD & Phosphorus Removal

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