Okay, this sounds fancy because it is fancy. A truck shows up, hooks up a giant machine, and it filters your whole pool through reverse osmosis. It’s like giving your water a spa day.
It removes calcium, salt, phosphates—the whole kitchen sink. But it costs real money. Like, “we’re eating ramen for a week” money. Worth it if your hardness is over 1000 ppm, though. You’ll feel like a pool god.
Pro tip: Your water will be super soft afterward. You might need to add a little calcium back in. I know, ironic, right?