Ultimate Block Salt is available in 8kg bags. Each bag contains 2 x 4kg blocks of Water Block Salt. Suitable for all Block Salt Water Softeners including BWT, Monarch, Kinetico, Harvey and many more. Pack Quantity available: 1 Bag = 2 x 4.0kg Blocks 2 Bags = 4 x 4.0kg Blocks 3 Bags = 3 x 4.0kg Blocks 6 Bags = 12 x 4.0kg Blocks Why should you switch to Monarch Ultimate Block Salt Firstly, Monarch are so confident of its quality; they have put our name on it. Secondly, it s BS EN973 approved and great for fish and chips too! For optimum performance and efficiency your water softener requires periodically topping up with good quality food grade Tablet Salt. Made with special care for water softness, Monarch Salt tablets dissolve evenly, so there are no problems with.