Hey, new to the forum. I’ve had my hot tub for about 4 years and the last 2 of those years I’ve used 35% H202. A little beige for just going with what a friend does to his without reading up on it but it works fine for me. I add 2 cups after water change with a good cleaning and touch it up with a cup in the near future. That’s it. Water stays clear, no smell, no cloud, easy on skin, just have to rinse or swap filter every double months, other than that it’s seems to be perfect. I do get the little rubber floaters after a bit but a filter clean and a little net to catch at any surface and it’s fine. Don’t actually use strips or check water at all, just go by feel basically and have had no problems. Great thread for info BTW