{
  "id": "shielding:shielding-line-filter",
  "collection": "shielding",
  "slug": "line-filter",
  "name": "Plug-in line filter (dirty-electricity filter)",
  "summary": "A capacitive filter that shunts high-frequency harmonics on a circuit; effects are circuit-specific, can shift harmonics rather than remove them, and can raise magnetic fields near the filter itself.",
  "status": "provisional",
  "lastVerified": "2026-08-12",
  "data": {
    "aliases": [
      "dirty electricity filter",
      "Greenwave filter",
      "Stetzerizer filter"
    ],
    "form": "filter",
    "targets": [
      "dirty-electricity"
    ],
    "requiresGrounding": false,
    "failureModes": [
      "Filters draw current, which raises the local magnetic field around the socket they occupy",
      "Can move harmonic energy to a different frequency band instead of removing it, improving one index while worsening another",
      "No recognised exposure unit to verify against; the common proprietary index is not an exposure metric",
      "Fixing the source (dimmer, driver, inverter) is cheaper and permanent"
    ],
    "related": [
      "emitters:dimmer-switch",
      "meters:dirty-electricity-meter"
    ]
  },
  "sources": [
    {
      "id": "sbm-2024",
      "title": "Building Biology Evaluation Guidelines for Sleeping Areas (SBM-2024)",
      "publisher": "Institut für Baubiologie + Nachhaltigkeit (IBN)",
      "url": "https://buildingbiology.com/site/downloads/SBM-2024_EVALUATION_GUIDELINES_EN.pdf",
      "year": 2024,
      "kind": "ngo",
      "retrieved": "2026-08-12"
    }
  ],
  "links": {
    "self": "https://emfbase.com/api/shielding/line-filter",
    "html": "https://emfbase.com/shielding/line-filter",
    "markdown": "https://emfbase.com/shielding/line-filter.md",
    "collection": "https://emfbase.com/api/shielding"
  }
}