Do polypropylene prefilters block chlorine?

I have an old Kenmore 625.384700 RO unit. Prefilters for it are getting hard to come by, but I came upon this post on the forum recommending a substitute -- the Pentek P5. So I stocked up on them.

Now that I've received them I see that they're made entirely of polypropylene rather than being the carbon block filters I'm used to. I assume they're just as effective at removing chlorine as carbon block filters or else no one would have recommended them, but I wanted to be absolutely sure before ripping off the plastic and installing one. Will polypropylene prefilters protect my RO membrane from chlorine?

Thank you very much.

Hi Andrew,
That is a great catch. The P5 will not reduce chlorine, only sediment. It appears that the post from 2006 you reference has incorrect information and I will update it shortly. You can exchange the p5s for http://www.filtersfast.com/Pentek-NCP-10-filter.asp or a Carbon block filter. The NCP-10 appears to be very close to what was originally used in the system. For carbon blocks, you could use a 5 or 10 micron like this one http://www.filtersfast.com/P-Watts-5...bon-Filter.asp. Customer service can handle the exchange for you. We apologize for the mix up.