Can someone please explain the results, the KH test took 13 drops and the GH test took 19 drops. It's the API test kit and it's not clear how to convert the
API GH/KH TEST KIT - Aquatics Unlimited
API GH & KH Test Kit | Freshwater Aquarium Water Test Kits – Aquarium Co-Op
API GH & KH Test Kit | Freshwater Aquarium Water Test Kits – Aquarium Co-Op