Click to expand Tap to zoom Aqua Pics KH Powder 7.0 with Potassium Save $-21.99 $21.99 | / 250g - $21.99 400g - $36.99 120g - $18.99 250g 400g 120g Size 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart This product increases the carbonate hardness of water and stabilises pH to ensure the good health and longer life of your fish.