Monitoring of water values. Determination of the optimal carbonate hardness in freshwater & marine aquariums & in ponds Colour change test: add reagent drop by drop until the colour changes from blue to yellow. Number of drops = KH level When to use: daily in the first week in newly set up aquariums, afterwards once a week Find detailed information & troubleshooting tips about water analysis on the JBL website in Essentials/Aquarium or Pond Package contents: 1 KH quick test, incl. one reagent and plastic cuvette. Reagent refill separately available
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