The strip can help your fish grow well fishes need it soft, need it hard, and very hard Maintain the amount of hardness in the water by testing regularly you have a water softener installed, check its effectiveness quickly by taking a water sample and testing with the strips Water Hardness Strips are very sensitive to the environment and changes to temperature Hard water leaves mineral build up in pipes and hastens that soft water runs in your by testing often Avoid hard water in your kitchenware by testing the water daily Hard water also reduces the lather of soaps, making it less efficient, Manufacturer: Fahou