FREQUENTLY  Asked  Questions   

What is RO? (Reverse Osmosis) 

RO (Reverse Osmosis) membrane is one of strong effective waste water treatment, it can remove 95% salt( such as calcium、magnesium…etc), heavy metal, chemical matter. RO (Reverse Osmosis) are widely applied in purify sea water, electrical pure water extraction, biochemical medicine, kidney wash, cosmeceuticals stores, beverages, bottle water and so on, which means Reverse Osmosis water purification system is fairly mature in technology.

To settle Sparse Liquid (ex: fresh water) and Dense Liquid (ex: sea water) with same cubit feet amount and block with semi-limpid membrane in the middle, the outcome – Sparse Liquid will flow into the membrane toward Dense liquid. On the side of Dense Liquid, the amount will larger than the side of sparse liquid, because of the infiltration balance.

If put a larger pressure to press the infiltration pressure, Dense Liquid will flow toward Sparse Liquid, and this action we call it – reverse osmosis wash. Reverse Osmosis wash method will happens when semi-limpid membrane catch unwanted substances while the pressure interlace between dense liquid and sparse liquid.

What is Reverse Osmosis? (Short Answer)
Reverse Osmosis is the reversal of the natural flow of osmosis. In a water purification system, the goal is not to dilute the salt solution, but to separate the pure water from the salt and other contaminants. When the natural osmotic flow is reversed, water from the salt solution is forced through the membrane in the opposite direction by application of pressure-thus the term REVERSE OSMOSIS. Through this process, we are able to produce pure water by screening out the salts and other contaminants. 

Home Reverse Osmosis System
RO Systems is a Home/Office Drinking Water System that uses the principle of reverse osmosis to remove 95-99% of all the mineral and chemical contaminants from raw tap water. Our commodities can give you the quality of bottled water with the convenience of a faucet mounted on your kitchen sink.

What way does Reverse Osmosis differ from a Water Filter?
Ordinary water filters use a screen to separate only particles of dirt sediment from water. Reverse osmosis employs a semipermeable membrane that removes not only particles but also an extremely high percentage of dissolved contaminants-molecule by molecule- from raw tap water.

Assume a membrane is semipermeable, allowing water to pass through while being closed to dissolved salts. Place a membrane between two compartments in a container as shown in the figure to the right. Then place a salt solution in one half of the container and pure water in the other half. Now a fundamental scientific principle comes into play. That is, two different concentrations of liquids within the same system will try to reach equilibrium (i.e. the same concentration of contaminants) on both sides of the membrane. Of course the only way for this to happen is for pure water to pass through the membrane to the salt water side in an attempt to reach equilibrium is called OSMOSIS.

What is actual process of  R.O. System?
The raw tap water first flows through a 5 micron particle FILTER
[1.] to remove dirt, rust and other sediment. The water then flows into a carbon briquette cartridge FILTER
[2.] which takes out 98% of the chlorine and organic chemicals. The next stage of the process is FILTER
[3.] 1 micron sediment filter or the block carbon filter to filter multi-chemical compounds and suspension.
[4.] The reverse osmosis membrane which will separate 95-99% of the dissolved contaminants from the water molecules. The contaminants are then washed down the drain. The next stage of the PURE PRO RO SYSTEMS process is the small CARBON FILTER
[5.] removes the remaining traces of chemicals, tastes and odors. The R.O. water is stored in a 3.2 gallons TANK
[6.] Inside the tank is a balloon-like rubber diaphragm, pre-charged with 8-10 psi of air. As the tank fills, the air pressure increases and pushes the water out when the faucet is opened. The final element of the system is a POLISHED CHROME FAUCET 
[7.] It is installed on the kitchen counter or the sink. It is a dual action faucet offering intermittent flow (to fill a glass, hold the handle down) or continuous flow (to fill a coffee pot, lift the handle up). 

Reverse Osmosis get start 
Although the idea of reversing osmosis has been known for over 10 years, the practical application is a recent development. In 1962 the U.S Government funded the first R.O. plant which processed 1000 gallons clean water per day. Today, there are more than 3000 large R.O. treatment plants, each producing more than a million gallons of drinking water each day. In 1991, the U.S. Army bought 8,000 large membranes to their mobile water purification units for troops in Desert Storm. In 1993, the U.S. Government bought another 6,300 large membranes to purify flood water in the Midwest.

R.O. remove - Bacteria & Cryptosporidium 
An R.O. membrane has a pore size much smaller than bacteria virus, pyrogen or the cryptosporidium parasite. When functioning properly it will remove all microorganisms from tap water and produce sterile water.

What are the factors that affect the quantity and the quality of the water produced?
There are four major variables to consider: 
[1.] PRESSURE. The greater the water pressure, the better the quantity and quality of the water produced. Water pressure of 60 psi ideal. However one booster pump can make sure the water pressure.
[2.]TEMPERATURE. 76*F is the ideal water temperature for R.O. 40*F water will cause the production of R.O. water to fall to half of that at 76*F. The maximum water temperature recommended is 85*F.
[3.]TOTAL DISSOLVED SOLIDS (TDS). The higher the amount of dissolved contaminants in the water, the lower the quantity of water produced. A high level of TOTAL DISSOLVED SOLIDS can be overcome with additional water pressure.
[4.] MEMBRANE. Different membranes have different characteristics. Some produce more water than others; some have better contaminant rejection capabilities; some have greater resistance to chemical abrasion for longer life. We have membranes combine the best of these characteristics and are considered the finest membrane in the world. 

How does the shipping process work? (Shipping)

Once the PO (Purchase Order) is received and approved with monies collected. The brand new units will be placed onto pallets and wrapped for protection securely and tagged. Most clients have their own FedEx and UPS shipping accounts. You are solely responsible for all shipping costs. We do NOT ship less than 4 units on a pallet for a simple reason. FedEx and UPS believe any pallet with less than 4 units on them is considered "wasted space" and will remove them from the pallet. This means the units are prone to damage when being shipped. Shipping usually take between 2 days and 1 week depending where you are located here in the States or what country your located in. Here in the States usually takes no longer than 4 business days. 

Make sure you inspect all the packaging and boxes before accepting the order from the shipping company. Once it's signed, EPW is not responsible for any damage to the units thereafter.

Do these coolers come shipped with filters already installed?

Yes, these units do have 5 filters installed already in them ready for use. However, the Advanced Filters are not installed and do not come with these units. These filters must be ordered in addition to the unit themselves. Of course you can buy filters whenever you need them after purchase.

How often do I need to replace the filters?

We recommend replacing the first 4 filters every 3-4 months with high usage. The 5th RO membrane filter is good for 2 years with the same usage. In many cases w/ units getting high volume, the 5th filter is removed so the internal tanks fill up faster. This does NOT affect taste of the water.  Not keeping up to date and changing the filters will cause the filters and tube lines to get clogged, causing damage to the components inside the water cooler itself. This will void your warranty and the parts associated with it. 


We offer a 3 year basic warranty. If any components go bad or break, and we deem the problem was faulty, EPW will replace the part for FREE of charge. We offer customer service over the phone to try and trouble shoot the problem, Free of charge.  The customer is responsible for paying the technician to diagnose any problems you are having with the unit in person. However, if any cooler has been modified, tampered with or show any signs of physical damage internally and externally, EPW is not responsible. Negligence in regards to not changing the filters as required will also void the warranty as well. (as stated in the section above)