Click to expand Tap to zoom Aquaforest Kh Buffer by Elite Koi Save £-9.95 £9.95 | / 1200g - £9.95 5000g - £37.95 1200g 5000g Title 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart An agent to maintain constant carbonate hardness in coral reef aquarium .