Appropriate pH adjustment in the pond is a prerequisite for problem-free water maintenance. The optimum pH in a pond is from 6.5 to 8.0.
Use a suitable tester to measure the water pH. If the pH is higher than 8.0, use pH MINUS to decrease it. Add 1 litre of the product per 100 cubic metres of water to decrease the pH level by 0.1 provided that the carbonate hardness of the water is sufficiently high. The dosage must be lower if the carbonate hardness is low.
Sprinkle the product diluted with water (one part of pH MINUS to 2 to 5 parts of water) onto the surface with a watering can. Reduce the pH level slowly: the pH should not fall more than by 1.0 over 24 hours. Periodical pH measurement of the water in the pond is recommended.