JBL StabiloPond KHpH balancer for garden ponds. Natural pond water balance: granulate to stabilise the pH value in the pond between 7. 5 and 8. 5 to successfully combat algae in the garden pond Easy to use: tells you the required quantity, you spread it on the pond Life insurance for fish and plants: prevents fish loss during algae blooms No risk for fish and plants, ecologically balanced: precise increase of carbonate hardness to stabilise the pH value and to provide