Product review (1 stars): Blackish water / water hammer / low flow rate / yuck!
I had been a GE water filter user for years, but, the prices GE charges for their filter got me to try another source, and I gave the Waterdrop filters a try.  I installed the waterdrop filters, and they at first caused a horrible 'water hammer' in my plumbing.  Followed by an unacceptably low water flow rate, then, a blackish water came out of my filtered water faucet.  Yuck!

I won't ever buy these again.