Quote Originally Posted by AZDesertRat View Post
The Dow Filmtec 100 GPD is actually a nano filter and not a reverse osmosis membrane so was never intended for drinking water type applications, it does not carry the same NSF certifications as the 75 and below and is only 90% rejection vs 96-98% for the others. It carries a "Pool and Spa Use" designation by the ANSI/NSF.

Make sure you are looking at the sale flyer as all the membranes and resins are on sale at quite a discount. The hand tested and guaranteed membranes are only $40 on sale.
Last question: will these $40 membranes fit my existing R/O units? Are they standard size?