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Of Carbon Block Filters Versus GAC Filters (granular activated carbon)
TFC Reverse Osmosis RO Membranes Versus CTA Membranes
Of Five Stage Versus Four Stage Reverse Osmosis RO Systems
Comparison Of Quick Change Replacement Water Filters Versus Standard
Comparison Of Carbon
Block Filters Versus GAC Filters (granular activated carbon)
GAC is crushed carbon held in a hard
plastic housing. Carbon Block is a solid carbon with a "net"
around the outside. Carbon Block is a superior design offering
1. Carbon Block will not
"channel" like GAC can. "Channeling" occurs when water forms a
flow path between the crushed carbon particles in a GAC filter.
Channeling can allow water to pass untreated. Carbon Block is
pressed so tight that the water must pass "through" it.
2. Carbon Block will not
release carbon "fines" like GAC will. "Fines" are very small
pieces of crushed carbon. GAC filters have a gray color to the
first few gallons of water when first installed. This is from the
"fines". It can continue to release "fines" even though they
may not be obvious to the naked eye. Carbon Block has no "fines".
3. Carbon Block inhibits the
growth of bacteria. Bacteria can grow in the space between the
carbon granules in a GAC filter. Carbon Block does not have any
space in the carbon for the bacteria to grow in.
4. Carbon Block filters
last longer than GAC filters, and are therefore a better value.
This is in addition to the superior performance of the Carbon Block
Comparison Of TFC Reverse
Osmosis RO Membranes Versus CTA Membranes
It is very important to determine the style of
reverse osmosis membrane your system uses. It will either be a CTA membrane
or a TFC style membrane. CTA membranes are made to allow contact with
chlorine in the water. TFC membranes are chlorine "intolerant" and cannot
come into contact with chlorine. The chlorine will destroy a TFC membrane.
Therefore TFC systems are ALWAYS equipped with a carbon pre-filter that
removes the chlorine. TFC can be utilized on ANY tap water system, well
or city. CTA or Cellulose Tri-Acetate membrane is an organic membrane. CTA membranes typically use a sediment prefilter and pass the chlorinated
water into the tank. The carbon post filter then removes the chlorine.
TFC or Thin Film Composite membrane is a synthetic membrane that has a removal
percentage between 94-99%. A TFC
membrane uses a carbon pre filter before the membrane to remove the chlorine
and then another carbon filter after the membrane to "polish" the water just
before dispensing. TFC membranes have a higher rejection rate of many
chemicals than CTA membranes and the extra carbon filter additionally removes
more contaminants than the single carbon filter used in CTA systems. TFC
membranes will typically last 3 to 5 years. CTA membranes typically last
18 to 24 months. CTA has a typical removal percentage of 86-94%.
Since the CTA is an organic membrane, it needs chlorine to protect itself from
damaging molds and bacteria. The CTA membrane MUST be run with chlorinated
water and cannot be run on non-chlorinated water systems (wells). The only way to know if your membrane is working
correctly is to measure and compare the TDS (total dissolved solids) in the
incoming feed water and the product drinking water. To do this you will
need a TDS Tester.
Comparison Of Five Stage
Versus Four Stage Reverse Osmosis RO Systems
The difference between a four stage reverse
osmosis RO system and a five stage system in most industrialized countries
such as the USA is typically the addition of a second carbon pre filter.
In some countries where the incoming water is not well treated or has high
turbidity the additional pre filter may be a sediment filter. Most five
stage systems come with the additional carbon filter. The additional
carbon filter is usually a GAC filter followed by a carbon block pre filter.
Click here to see a comparison of the two. The
additional carbon pre filter assures a more complete removal of many
contaminants. It also helps assure the removal of the chlorine which can
damage a high quality TFC RO membrane.
Comparison Of Quick Change
Replacement Water Filters Versus Standard Replacement Cartridges
Quick change filters are self contained.
They usually "screw" into the filter head. When replaced you simply
unscrew them and discard the entire one piece filter. Standard
replacement cartridges are filters that fit inside of a filter "housing".
To replace, you unscrew the housing and remove the cartridge inside.
Then clean the housing and install a new cartridge and screw the housing back
onto the "head". The advantage of the Quick Change filters are that they
are faster and easier to change. Since you are throwing away the housing
there is no need to sanitize it before installing the new filter. The
advantage of the standard style filter cartridges is that they are less
expensive and more readily available.
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