Product review (1 stars): Hessitant about the filtration quality. Wouldn't buy again

I recently purchased this AQUACREST Water Filter. I have a Brita pitcher and I bought these in substituion for the "MAVEA 105731 Maxtra 6-Pack Replacement Filter for MAVEA Water Filtration Pitcher".
The thing is that once I installed them on my pitcher, I noticed that the water filtering is twice faster than with the previous Mavea filter. Which I whought it was a great thing. After a couple of days of use I'm noticing the water tastes different, almost as if I was drinking water directly from the faucet, without filtering.
I followed their filter usage suggestions and already tried with 2 filters from the same package and it happened the exactly same thing. I'm pretty dissatisfied with the product. And I'm hessitant about continue to use it since I'm under the impression that the filtration process is not as good as with my previous filters.
I contacted the seller but got a pretty standard answer saying it was a normal phenomemon and that they would pass the feedback to their engineers, but this never happened with the Mavea Maxtra filters. Guess better stick to those.