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What one dose does
PARAMETER
1 ml / 100 L
Iodine
+0.4543 ppm
To raise iodine by 0.02 ppm in 100 L: 0.044 ml.
How it’s used
Advanced users only; test first. Aquarium dose ml = US gal x ppm rise x 0.0757 (x20 for drops). Dip: about 1.2 ml per 1 US gal of tank water (14.4 / label ppm-per-gal) for 10-12 minutes.
Cautions
• Strong iodine/iodide solution; overdose is toxic to corals and fish.
• Two strengths exist; read the label before calculating.
• Contact poison control if ingested.
Sources
Brightwell states Lugol's has been sold in two strengths (changed for regulatory reasons) and the label governs. A retailer listing cites 34 ppm per ml per gal (older strength). Stored the current 12 ppm figure; the 50,000 ppm guarantee implies 13.2.