Do chloramines have to be removed if only a small amount of water is added to an aquarium or pond to make up for evaporation loss?
To know for sure, you'll have to monitor for total chlorine residual. Chloramine residuals in water used to keep fish should be kept below 0.1 mg/L. Total chlorine test kits are available from pet stores, pool supply stores and chemical supply houses. Make sure, however, that the kit is for "total chlorine" or "combined chlorine," not "free chlorine." A free chlorine test of chloraminated water would read zero but still be toxic to fish.

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1. Why are chloramines toxic to fish?
2. Are chloramines toxic to both saltwater and freshwater fish?
3. Do chloramines pose a hazard to koi?
4. Will letting water sit for a few days cause chloramines to disappear?
5. Do chloramines have to be removed if only a small amount of water is added to an aquarium or pond to make up for evaporation loss?
6. Will a carbon filter remove chloramines?
7. Will reverse osmosis remove chloramines?
8. Will boiling remove chloramines from water?
9. Who can I contact if I have additional questions about chloramines?