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My wife is pushing for one of these very expensive home water treatment/filtration systems, but it all feels like a scam to me. No one I know has one, so turning to random strangers on the internet for opinions.

Edit: We're on city water in a decent area. No well water. It's more about removing the chlorine and microplastics than anything.

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[–] Fermion@feddit.nl 3 points 11 hours ago* (last edited 8 hours ago)

If her primary concern is drinking water, you can get an under sink RO filter for a couple hundred. They're very easy to install yourself. I've even helped a friend install one connected to their fridge so that the fridge dispenser would taste better. We are on city water that tests well except for microplastics and it sometimes tastes a little bit like soil or musty. The RO systems come with a particulate filter, carbon stage, Reverse Osmosis membrane, and a remineralization stage. RO is the only way to effectively remove microplastics.

Personally, I would consider having a particulate filter and maybe water softener for the whole house. Neither of those should be crazy expensive. The water softener is only if your city water tests hard or if you have mineral buildup on your shower heads or in your dishwasher. If you've done any plumbing work, a particulate filter is pretty easy and affordable to install yourself.

Reverse osmosis for the whole house is simply unnecessary. Install one yourself at the location your family gets their drinking/cooking water.

https://www.mcmaster.com/product/4361K71

This unit from mcmaster carr is what I use. Please be aware that chlorine does damage the RO membrane, so it is important to replace the first two filter stages approximately every 6 months. The fourth stage is recommended to be replaced yearly and the RO stage is supposed to be good for 2 yrs.

https://www.mcmaster.com/4361K81/ https://www.mcmaster.com/4361K82/ https://www.mcmaster.com/4361K83/ https://www.mcmaster.com/4361K84/

Express Water also has some decent under sink and counter top options.

Removing chlorine for the whole home requires a large activated carbon filter. They're pretty expensive and the media gets saturated and has to be replaced every so often to keep absorbing chlorine. I would only do this if your wife has extremely sensitive skin that is getting irritated from your tap water.

Oh and Reverse Osmosis systems waste more water than they clean without expensive recirculating pumps and controllers. That's acceptable for a couple gallons of drinking water a day, but would be very wasteful and expensive in a whole-house system.