I beg to differ. I installed UA about 10 months back And that i am stunned by its performance. Especially the prop is sparkling clear - see the pic - about 5 months of it was in tropical waters, the shiny places are bare steel in which the antifouling peeled https://zaneqbktz.techionblog.com/35900935/cost-of-oxygen-therapy-can-be-fun-for-anyone