Clear, sparkling water is not always a sign of a healthy pond. Despite it's appearance your pond may contain hidden compounds which are particularly damaging to fish and plant life. Without regular care and maintenance toxins may build up unnoticed. Testing for ph, Nitrites and Nitrates is essential not only before fish are introduced but afterwards as well so that any changes in water conditions are quickly identified and remedied. The simple secret to trouble free pond keeping. Three easy chemical tests with clear instructions. Acidity and Alkalinity (ph) Toxic Pollutants (nitrites) Water Quality (nitrates) 24 tests