Experienced aquarists regularly test aquarium water. This allows for measures to be taken, for example against algae, quickly and easily, without the need for chemicals.

The Sera Koi Water Test Kit contains the following test sets:

• pH Value
• General Hardness (GH)
• Carbonate Hardness (KH)
• Ammonium/Ammonia (NH4/NH3)
• Nitrite (NO2)
• Nitrate (NO3)
• Phosphate (PO4)
• Iron (Fe) and
• Copper (Cu)