Was curious, where does all the stuff that's filtered out go? And then industry sites like https://americanhomewater.com/the-truth-about-reverse-osmosi... raise more questions which probably have better answers.
I’ve got one set up for my drinking water and it’s 1:1, so a gallon of waste water for every useful gallon. Others use even more.
Obviously I don’t feel great about the waste, but I’ve got two kids under 6 and I’m trying to do what I can to avoid dosing them with this crap.
I do my best to make up for it in other ways - not watering any landscaping, scraping but not rinsing dishes, water off while brushing teeth/lathering hands, low flow shower heads and toilets, etc. But I'm not aware of another way to get sufficiently clean water.