I use APEC RO 90.

https://www.amazon.com/dp/B00HRHHFPW

If you wish to install yourself, it might worth it to get some water pressure sensor first. The system want to see 40 PSI and above for it to work well, so if your pressure at faucet is less than that consider getting the version with pump.

Also it would be easier if your sink have some place ready for the filtered water dispenser to go through. If not you might need to change your kitchen faucet to those type that have filtered water faucet to avoid drilling through your countertop.

The taste is much, much better. I am in the service area of great oak water and they use well water. 3M filter made the water drinkable but still not good in any stretch. I often need to drop a tad bit of lemonade into my water to make it easier to drink.

Now I just pour a 30 oz glass and drink it up in one go. No hesitation and no aftertaste.