I don’t like the very idea of decantation. Did you ever drink the decanted water? It tastes awful, no matter how long do you decant it. Because the water is full of impurities you cannot get rid of using decantation method. It’s about salts and other impurities, I think. At the same time, osmosis water filters remove bad taste and make water pure. I found it out while reading Pure Water Guide site. There are a lot of articles about water filtration and reviews of water filters on the site. Including osmosis ones. I think the information I learned there is more than reliable.