The review concerns the double filter. It is a very bad purchase!

Positives
1. The water is very good.

Negatives
1. Impractical as once you screw it to operate, it is then impossible to unscrew it (to change its parts) without a serious risk of breaking something since you have no firm grip.
2. It does not work properly. Specifically, as soon as you close the faucet after use, water continues to run for 35 seconds.

I would not recommend it for any reason.

After years (over 15) of using a filter that is heavily advertised on television, I have to say that this particular product, which replaced the first one and I have been using for over 3 years, is not inferior to the well-known advertised ones. Don't waste your money on the scams that exploit the goodness of water and health! Changing it every six months with the corresponding replacement (0.5 micron) does the job perfectly! (I use the single filter)