Short Answer: No.
Long Answer:
In 1991, the WaterWorks filtration system was built with four progressively finer filters that delivered pharmaceutically sterile water, without chemicals. The first element was a porous foam prefilter that stopped large particulates from entering the system. Water then passed through a stainless steel wire mesh screen that trapped remaining particulates like silt and algae. Next, an activated carbon core removed bacteria, protozoa and errant chemicals and pesticides. Finally, water flowed through a 100% tested, pharmaceutical-grade membrane filter that removed the remaining bacteria. This succession of smaller filters extended the life of each element and also made the WaterWorks the most effective filter on the market.
In 1994, the WaterWorks received a significant upgrade that changed the game in portable water treatment. Recognizing the benefits of ceramic, MSR engineers added a ceramic cylinder around the filter’s carbon core, making the WaterWorks better for large groups and truly tough water conditions. Ceramic had smaller pores, so it filtered more thoroughly and protected the membrane element from clogging as quickly. Ceramic could also be easily abraded to clean it for “flow rate recovery”. The WaterWorks was the first of its kind to combine the benefits of carbon and ceramic. Together, they offered greater effectiveness, longer filter life and reduced chemicals and bad taste. This upgrade also allowed the screen filter to be removed, streamlining the filter's design. Now the WaterWorks could handle the most demanding backcountry conditions and was able to filter five times more water than others before clogging. It was intended, the engineers wrote, for “serious outdoor enthusiasts.”
In 1996 MSR introduced its premium Marathon Ceramic element, which debuted in both the WaterWorks II and a brand new compact filter—the MSR MiniWorks Microfilter. Boasting the Marathon, the MiniWorks offered superior water treatment suitable for backcountry travelers, without the final membrane filter that made the WaterWorks larger and heavier.
In 2003, the MiniWorks EX received AirSpring Accumulator technology, which allowed it to pump water 45 percent faster. This engineered pocket of air in the filter housing acts as a cushion, expanding and compressing as the user pumps. As the air pocket compresses, it stores the effort from the pump. On the handle’s out-stroke, the air expands, pushing the water through and adding efficiency.
Check out our blog post for more detailed information on this topic: https://cascadedesigns.com/blogs/msr-gear-guides/gear-archives-trusted-source-evolution-miniworks-ex-microfilter