Determines the phosphate value for perfect plant growth or possible cause of algae growth in freshwater/marine water & ponds Laboratory comparator system to compensate the inherent water colour: fill glass vials with sample water, add reagents to a vial, place vials in holder, read values off colour chart Use: when setting up a new freshwater or marine aquarium: once a week. With algae problems and for checking tap water You will find detailed information and troubleshooting tips about water analysis on the JBL website in Essentials/Aquarium or Pond Package contents: 1 test kit for approx. 50 measurements, incl. 3 reagents (2x reagent 2), 2 glass vials with screw caps, syringe, dosing spoon, comparator block and colour scale. Reagent refill separately available