APEC aka freedrinkingwater.com specializes in nsf certified water filter parts and reverse osmosis water filter systems and purifiers , your one stop solution to most water contamination and water pollution problems. Pure water and safe water guaranteed!

This is why we are the most comprehensive web site for Reverse Osmosis Systems. Many sellers of RO systems do not even know how ROs are affected by water pressures and temperatures. When retailers just sell inappropriate systems for the customer's situation, consumers will be surprised by problems like:

Common Problems	Cause
Why there is no water in the tank?	Not enough input pressure to work the chosen system model
Gee, it takes all day for the tank to be filled!!	Chose the system with inappropriate GPD or model
Why does the water taste so bad?	Membrane has failed because the chosen system is unable to treat the user's type of water
Help! my system just blew up and our house is flooded with water!	Chose booster pumped system unnecessarily —a common error of misleading web sites

As you can see, it is important to choose the right RO system to match your water situation. This will keep your system running at top shape and your water tasting great for years.

A simple way to choose your RO system:

Your Water Supply	Water Pressure	Recommended Model	Comments
city water or well water	40-100 psi	Standard RO System	You can use a Standard RO System, either RO-45 or RO-90 (45 GPD or 90 GPD), saves you money!
lower pressure well water	30-50 psi	Low Pressure Permeate RO System	Low pressure; you probably are on a well water system in the U.S. or in a different country.
overseas	0-30 psi	No Pressure Pumped RO System	Extremely low pressure; you are either in a different country, or in the U.S. but with very unique water situation.

If you have to size your system precisely, then you need to understand that the actual flow rate GPD(Gallons Per Day) of any reverse osmosis system depends on your home water pressure and temperature. This is why all of our systems are named as they are, for example: 36/45 GPD means it is rated at 36 GPD at 50 psi of water pressure, 45 GPD at 60 psi. While the industry standard is set at 60 psi, we know that not everyone's cold water is at 60 psi and 77 degrees F. Instead of misleading customers into thinking that a 45 GPD system will guarantee a flow rate of 45 GPD, we remind you that you might get less than 45 GPD —perhaps 36 GPD or even less if your pressure and temperature are very low! So when flow rate is critical for you, you need to consider all these factors.

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Facts On Reverse Osmosis Water Filters

Reverse osmosis, also known as hyperfiltration, is the finest filtration known. This process will allow the removal of particles as small as ions from a solution. Reverse osmosis is used to purify water and remove salts and other impurities in order to improve the color, taste or properties of the fluid. It can be used to purify fluids such as ethanol and glycol, which will pass through the reverse osmosis membrane, while rejecting other ions and contaminants from passing. The most common use for reverse osmosis is in purifying water. It is used to produce water that meets the most demanding specifications that are currently in place.

Reverse osmosis uses a membrane that is semi-permeable, allowing the fluid that is being purified to pass through it, while rejecting the contaminants that remain. Most reverse osmosis technology uses a process known as crossflow to allow the membrane to continually clean itself. As some of the fluid passes through the membrane the rest continues downstream, sweeping the rejected species away from the membrane. The process of reverse osmosis requires a driving force to push the fluid through the membrane, and the most common force is pressure from a pump. The higher the pressure, the larger the driving force. As the concentration of the fluid being rejected increases, the driving force required to continue concentrating the fluid increases.

Reverse osmosis is capable of rejecting bacteria, salts, sugars, proteins, particles, dyes, and other constituents that have a molecular weight of greater than 150-250 daltons. The separation of ions with reverse osmosis is aided by charged particles. This means that dissolved ions that carry a charge, such as salts, are more likely to be rejected by the membrane than those that are not charged, such as organics. The larger the charge and the larger the particle, the more likely it will be rejected.

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