Question 1

Which is better, Berkey BK4X2 Big Berkey or ProOne Big+ Gravity Filter?

Accepted Answer

Based on our testing, the Berkey BK4X2 Big Berkey scores higher overall at 9.1/10. The Berkey BK4X2 Big Berkey scored 9.1/10 and the ProOne Big+ Gravity Filter scored 8.9/10 in our Best Gravity Water Filters 2026 evaluation.

Question 2

Is the Berkey BK4X2 Big Berkey worth it over the ProOne Big+ Gravity Filter?

Accepted Answer

The Berkey BK4X2 Big Berkey scores 9.1/10 while the ProOne Big+ Gravity Filter scores 8.9/10. The Berkey BK4X2 Big Berkey is our "Best Overall" pick in the Best Gravity Water Filters 2026 category.

Berkey BK4X2 Big Berkey vs ProOne Big+ Gravity Filter: Which to Buy?