There is considerable progress in perfecting these. But my own personal theory is it will be some time before the bugs are out of these. I believe if these are used along with a sanitizer and not as the only source of sanitizing pools and spas, we can utilize them effectively. But for these alternative sanitizers to compensate for higher swimming loads, no swimming, variations in temperature, etc., they cannot respond fast enough, they can overcompensate or not compensate fast enough, for them to give us the safe water we need constantly. Some are pool algaecides, but excellent at killing bacteria, or just the opposite. Some add to TDS buildups; others (ozone) do not. This should be considered if TDS buildups are a problem. All alternative sanitizers have both positive and negative aspects and all of these should be considered if you intend to try them. I will stay with what works for me; but I keep an open mind and read all the information I can find on new developments.