PONDPOISE

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Water Quality Science

The chemistry and biology that keep a pond healthy — the nitrogen cycle, the bacteria that drive it, and the ammonia, nitrite, and algae problems that show up when it's out of balance.

Nitrogen cycle

Nitrogen cycle

Ammonia

Ammonia

Nitrate

Nitrate

pH

pH

Water quality

Water quality

Nitrification

Nitrification

Dissolved oxygen

Dissolved oxygen

Algal bloom

Algal bloom

Chlorine

Chlorine

Eutrophication

Eutrophication

Ultraviolet germicidal irradiation

Ultraviolet germicidal irradiation

Water treatment

Water treatment