AQUACREST 9001 Under Sink Water Filter, Compatible with Moen 9001 PureTouch AquaSuite MicroTech 9000

Can anyone explain why water passes through these filters faster (less effectively?) than through the much more expensive brand-name filters?

Will the filter remove Arsenic in the water?

I usually use the "Microtech 9000 replacement filter". Is this one (9001) will work on my filter system?

What is the country of origin?