Test kit Revacil MAREVA pH and PHMB which will be very useful in the control of PHMB (biguanide) and the pH of your pool, to ensure healthy water. Advantages: Easy to use Measuring pH and biguanide Refills available for sale Performance: Test kit Revacil pH and PHMB Directions for use: Fill the entire water comparator up to the measurement line Remove any excess water Add 6 drops of the reagent Biguanide and pH, in each of the chambers provided for this purpose Butcher comparator and return to mix Read the level of Biguanide and pH Clean immediately after use Packaging: Delivered in its original packaging