I have a bottle of Seachem's Reef Iodide. Concentrated to 8,000mg/l
The bottle is 250ml...meaning it actually contains 2000 mg of iodide. Iodine levels in seawater is naturally around 0.06mg/l
Now..just imagine how long will it be before I actually finish the bottle? I only dose it once every fortnight-3weeks? Used it for 2 years already and it's still more than 9/10 full.