For all the people who ask about the saltron mini for their hot tub, here is my experience. We bought ours in August of 2019. Set it all up and worked great. We have the setting at 7 and for our tub it maintains the chlorine levels perfectly. About once a month we add muriatic acid to lower the PH. Other than that we change the water about 3 times per year. The cell finally gave up the ghost on Dec 26. Ordered a replacement and 2 days later we were back up and running. Original cost was $400. Replacement cell was $200 and it lasted a total of 16 months. Very inexpensive especially considering I don't have to even think about maintenance on the water levels.
At first I checked the levels almost daily until I knew it was working well and my settings were correct. After that i tested once a week. Now I test about every 2 weeks and every single time my readings are the same. If you are tired of hauling bleach everyday, I highly recommend you make the switch. We did get a bit of rust on 1 stainless steel ring but that's all and I contribute that to simply bad stainless in that 1 section.
At first I checked the levels almost daily until I knew it was working well and my settings were correct. After that i tested once a week. Now I test about every 2 weeks and every single time my readings are the same. If you are tired of hauling bleach everyday, I highly recommend you make the switch. We did get a bit of rust on 1 stainless steel ring but that's all and I contribute that to simply bad stainless in that 1 section.