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3.5.4
Point Of Entry (POE) Reverse Osmosis System
A larger version of the POU systems, this treatment device delivers reverse osmosis quality water to the
entire household. The current market for this product is limited because of the cost and water recovery of
these systems. Since much more water is required for the entire house as opposed to a single tap, water
loss becomes a larger issue.
3.5.4.1 POE RO Disadvantages
The following are a number of notable disadvantages as compared to the MAYTAG Whole Home Water
Filtration System. Most POE RO systems:
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3.5.5
have very low peak flow rates and as a result require a large storage capacity,
may require extensive renovations because of their large footprints,
have higher whole house water costs ,
have prefilters that require more frequent replacement,
have very low recoveries (25% - 50% recovery),
have a raw water hardness limitation16 (17 mg/l or 1 grain/gal.),
have a raw water iron limitation 17 (0.1 mg/l),
have a raw water manganese limitation 18 (0.05 mg/l),
have much higher energy costs (requires dedicated pump),
have high energy consumption to produce filtered water,
can cause problems with piping, as RO water is corrosive on copper piping,
remove all minerals (essential and non-essential).
Point Of Entry (POE) Ultraviolet Sterilization
This technology has gained popularity in recent years because of its availability and non-chemical
microbiological disinfection claims. With proper preconditioning, this technology can effectively
inactivate microbiological threats from drinking waters.
3.5.5.1 POE UV Disadvantages
The following are a number of notable dis advantages as compared to the MAYTAG Whole Home Water
Filtration System. Most POE UV systems:
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do not provide a physical barrier to bacteria, viruses and cysts,
allow inactivated pathogens to be consumed after disinfection,
are not all proven to inactivate cysts,
can potentially allow dangerous microorganisms into the household water distribution system
during power outages or when UV lamps turn off .
have a raw water colour and organic limitation that lead to premature fouling of system lowering
the treatment effectiveness,
have a raw water hardness limitation 19 (105 ppm or 7 grains per gallon),
have a raw water iron limitation 20 (0.3 ppm),
have a raw water manganese limitation 21 (0.05 ppm),
have much higher energy costs,
do not lower turbidity.
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Source water levels higher than this should be prefiltered to ensure optimum membrane performance.
Source water levels higher than this should be prefiltered to ensure optimum membrane performance.
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Source water levels higher than this should be prefiltered to ensure optimum membrane performance.
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Source water levels higher then this should be prefiltered to ensure optimum UV performance.
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Source water levels higher then this should be prefiltered to ensure optimum UV performance
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Source water levels higher then this should be prefiltered to ensure optimum UV performance
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