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Most koi ponds benefit from 10-20% water changes weekly. During quarantine or treatment, frequency may increase to every 2-3 days. The ideal schedule depends on your bioload, filtration, and water test results.
Typical water changes range from 10-30%. Avoid changing more than 30% at once unless in an emergency, as large changes can shock fish with sudden parameter swings. Always dechlorinate new water.
Yes, always dechlorinate tap water before adding it to your pond. Chlorine and chloramine are toxic to koi and will damage gills and skin. Use a quality water conditioner and add it before or as you add new water.
Follow your specific treatment protocol. Some treatments require water changes between doses to remove medication. Others require maintaining concentration. Always check product instructions.
Moderate water changes (10-20%) have minimal impact on biological filtration since bacteria live on filter media and surfaces, not free-floating in the water. Avoid cleaning filters and doing water changes on the same day.