Carbonate hardness and pH values are the most important parameters to evaluate the stability of the pond water. The target values for the pH levels are between approx. 7.5 and 8.5, whereby the fluctuations over the course of the day also have to be taken into account.
Stable pH levels are most easily achieved by a sufficient carbonate hardness of 4 °dKH or more.
To check both of these values JBL has introduced the JBL PondCheck . Both are drop tests. The pH test has an indication range between 3.0 and 10.0 and serves as orientation. The carbonate hardness test works as follows: 1) Rinse a test vial with pond water and fill it afterwards with pond water up to the marking 5 ml. 2) Add 5 drops from the JBL PondCheck KH bottle and mix the samples by swirling gently. 3) If the water turns blue a sufficient quantity of KH is available. With a yellow/orange colour there is a lack of KH. In this case a dosage of JBL StabiloPond Basis is recommended.