We installed our 20,000 gallon pool 1 year ago. My husband was obsessed about the pool chemistry. He was trying everything to get it right. I saw the Water Guru demonstrated on YouTube. I ordered immediately and it is a life changer and saver for pool management. Once a day, I get a notice on the app that identifies necessary changes and chemicals needed. If none are needed, then it lets me me by both numbers and graphs what the pool chemistry and pool pump are doing. Best pool purchase. Also the support team is excellent. I recommend the Water Guru System.