I have just a cheap 100-200 buck system off Amazon. Have to make sure to watch it asi t doesn't shut off by itself. Had a oops once or twice. Works great here drops it to 30 from 300 good enough. Really I could just use tap 300 isn't bad but this is nice to remove metals and  some of the chemicals. Simple small 5 stage is all and 2x50 gal barrels to store it.