I don't like these things, I have 2 and every part of the pump broke, first the holder broke the tabs and then the holder completely cracked in 2. Then my pump will not click the 2 halves together and fall apart.. Now everything is being held by zip ties. And the prop spin somewhat un-true needs to be aided at start up
But Tunze's customer service is great and I have gotten replacement parts only to break again so for now it's working OK and I am going to mix salt with it when get better alternatives.