If your goal is filtered water for drinking and cooking at a reasonable cost, an under sink filter with an advanced carbon block 1 micron cartridge would be the answer. It's a standard 2-1/2" x 10" filter.
This is what the cartridge label says: removes chlorine taste and odor, lead, cysts, chloramine, MTBE, VOC, mercury, asbestos, particulate class 1, turbidity. Cost? under $18.
Yes, you might have to replace the cartridge (depending on use) more frequently. My solution is to install a whole house filter with a standard 2-1/2" x 10" 5 micron filter before the under the sink filter.
I question the value and the claim of the pelican filter.