Yellow Pond Water: Tannins from Leaves

Cause

Yellow/orange water = tannins from decaying leaves. Not directly toxic, but can lower pH and affect water chemistry.

Fixes

1. Activated carbon in filter (mesh bag). Replaces monthly or when water yellows again.
2. Dense filter mats before carbon to trap particulates.
3. Skim leaves daily; net cover in fall.
4. Partial water changes (10–20% weekly) dilute tannins.

Carbon Maintenance

Carbon pores fill up and stop working. Replace when water color returns. Frequency depends on leaf load.

Fish Safety

Tannins alone rarely kill fish, but associated pH drop can stress them. Monitor pH weekly.