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What one dose does
PARAMETER
1 ml / 100 L
Iodine
+0.0237 ppm
To raise iodine by 0.02 ppm in 100 L: 0.85 ml.
Maker’s daily maximum: 5.3 ml per 100 L (5.3 ml for 100 L).
How it’s used
Target 0.04-0.06 ppm. Basic: 5 ml per 50 US gal every 2-3 days. If below target, up to 5 ml per 25 US gal daily until reached. Start low on small tanks (retailer staff suggest ~1 ml per 10 US gal).
Cautions
• Iodine overdose is harmful to invertebrates; test before dosing.
• Contact poison control if ingested.
Sources
Brightwell's own page gives no potency ('use amount on bottle'). Retailer label transcription gives 0.625 ppm/ml/gal with 2,367 ppm, which fits the basic dose (5 ml/50 gal -> ~0.06 ppm). A search snippet attributed another retailer listing claiming 4 ppm per ml per gal with 15,000 ppm (probably an older/other strength); that would make the basic dose ~0.4 ppm, far above target, so it was not used. Verify against the bottle in hand.