TetraPond Kits are both reliable and accurate, using professionally designed methods to determine if your water is safe for Koi Fish.
Nitrate is produced from the breakdown of nitrite in the filter. Nitrate is relatively harmless to freshwater fish, but its presence can indicate a deterioration in the aquarium environment, and high nitrate will encourage algal growth.
The only way to know what the nitrate level is, is by testing it with a TetraTest Nitrate kit. Regular testing will help you to assess the overall health of the environment.