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DOW Filmtech TW30-1812-36 Hey everyone, Aquaman here with FilterDoctor.com.
Today we’re looking at the DOW Filmtech TW30-1812-36.
This is an industry standard size, 36 gallon per day, membrane for reverse osmosis systems.
Now, to understand industry standard size you need to know a few things. There are many
RO systems that have proprietary membranes, meaning that you have to get a specific membrane
for that system. But, many RO systems now are moving to industry standard size membranes,
which means there are many manufacturers that make the same size and type of membrane that
will all fit in that membrane housing. They are 11 ¾ inches in length from tip to
tip. They have a 2 inch diameter brine seal. The brine seal is this black rubber ring around
the outside of the body of the RO membrane. It is 2 inches in diameter, or width. And,
important, the *** end with the O-rings is opposite of the brine seal. If the ***
end on the same end as the brine seal has those little O-rings, that is not an industry
standard size membrane. Now this one happens to be a 36 gallon per
day membrane, and you need to make sure you get the right gallon per day rating for your
system, unless you’re willing to change your flow restrictor to match the new gallon
per day rating of a different membrane. Now DOW Filmtech membranes are NSF Standard
58 certified so they’re a very good quality membrane, and they use a unique material that
is 20% more efficient at purifying water than most competitors. So DOW Filmtech is a leading
brand that you want to look for when you’re looking for a different membrane.
They are not chlorine tolerant, which is pretty typical with most modern membranes. It just
means you need to have a carbon filter removing chlorine before the water gets to the membrane;
otherwise the chlorine is essentially going to burn the membrane material.
Now, knowing when to change your membrane is really easy if you use a TDS meter. You
could just go by the rule of thumb, which is to change it every two years. But owning
a TDS meter will allow you to measure in a scientific way, when your membrane is actually
expired. If you’re not removing at least 75% of the total dissolved solids, then your
membrane is expired and it’s time to get a new one.
Again, this is the DOW Filmtech TW30-1812-36, and I’m your host Aquaman with FilterDoctor.com.
Thanks for watching.