GH is a measurement for the total quantity of dissolved minerals in the water fish need these for growth and general health. Ideally this should be between 8-12
Acid rain can lower the pH and sunlight can deplete the GH. Aqua Source GH/KH Buffer will stabilise the water and maintain the balance in the pond, when used as recommended. 1kg will increase the KH by 2° and the GH by 4°, 1kg will treat 10,000 litres.
Directions - Mix the contents in a bucket of pond water and spread evenly into pond. Repeat dose as necessary -- This product will cloud the water for a few days.