Guide topic
Koi Pond Chemistry
Plain-English, source-cited guides to keeping koi pond water healthy.
Guide
Koi pond water parameters: the levels that matter
Targets and danger thresholds for pH, ammonia, nitrite, nitrate, KH, and salt.
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Guide
Why your koi pond pH crashes — and the KH fix
Why low KH causes overnight pH crashes, and the baking-soda dose that fixes it.
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The app for this
Pond: Koi Chemistry
Enter a test reading + pond volume and get the exact corrective dose — baking soda for KH, brand-aware products for ammonia/nitrite — with named-source warnings (Pond Informer, Microbe-Lift, API Pondcare) and seasonal reminders. Pay once, no subscription, works offline.