Reverse Osmosis or Undercounter Filter?
txjoyce
12 years ago
Featured Answer
Sort by:Oldest
Comments (9)
asolo
12 years agoRelated Discussions
Do nny od you have a reverse Osmosis Water Filter?
Comments (7)From our FAQ's: A good rule of thumb is to replace your sediment filter and carbon block after six months. A more precise way to maximize the useable life of these two filters is to use a pressure gauge to identify when pressure reaching the membrane starts to decline. This is your indication one or both of the filters is beginning to clog. Also be cognizant of the chlorine capacity of the carbon block. A good 0.5 micron carbon block for example will remove 99% of chlorine from 20,000 gallons of tap water presented at 1 gpm. Some original equipment suppliers commonly provide carbon cartridges rated at 2,000 to 6,000 gallons. Regarding your RO membrane, use your TDS meter to measure, record, and track the TDS (expressed in parts per million) in two places: 1. Tap water 2. After the RO The TDS in your tap water will likely range from about 50 ppm to upwards of 1000 parts per million (ppm). Common readings are 100 to 400 ppm. So for sake of discussion, let's say your tap water reads 400 ppm. That means that for every million parts of water, you have 400 parts of dissolved solids. How do we go about getting that TDS reading down closer to zero? If you do some experimenting with your TDS meter, you'll note that your sediment filter and carbon block filter (collectively called "prefilters") do very little to remove dissolved solids. So with your tap water at 400 ppm, you can measure the water at the "in" port on your RO housing and you'll see it is still approximately 400 ppm. The RO membrane is really the workhorse of the system. It removes most of the TDS, some membranes to a greater extent than others. For instance, 100 gpd Filmtec membranes have a rejection rate of 90% (i.e., they reject 90% of the dissolved solids in feed water). So the purified water coming from your 100 gpd membrane would be about 40 ppm (a 90% reduction). Filmtec 75 gpd (and below) membranes produce less purified water (aka "permeate"), but have a higher rejection rate (96 to 98%). The life span of a RO membrane is dependant upon how much water you run through it, and how dirty the water is. Membranes can function well for a year, two years, or more. To test the membrane, measure the total dissolved solids (TDS) in the water coming in to the membrane, and in the purified water (permeate) produced by the membrane. Compare that to the membraneÂs advertised rejection rate, and to the same reading you recorded when the membrane was new. Membranes also commonly produce less water as their function declines....See MoreConnecting reverse osmosis water filter to fridge only
Comments (2)A different and inherently more expensive type of RO system may be needed, depending on whether you can adapt what you have. Nominally, an RO membrane (preceded by some set of filters) will produce filtered water and waste (brine) until the back pressure approaches some fraction of the input pressure. The filtered water would go to a pressure storage tank and thence to the faucet or refrigerator, the brine is dumped into a drain pipe. Unfortunately, this simple description would lead to a brine flow that was always on. Hence the special faucet that controls the input to the RO filter. To get more output pressure and avoid this type of faucet, pumping schemes that lower the pressure on the output of the RO membrane while increasing it into the pressure storage tank are used along with simple controllers. (SpectraPure sells pumps for this purpose.) One type uses the brine pressure itself to drive the pump. For control one also needs pressure sensors, a controller, and a water flow cut-off solenoid. kas...See Morewater purification with reverse osmosis and block carbon filter
Comments (0)Does anybody have a water filtration unit that does "reverse osmosis (RO) combined with a superior carbon filter"? Ive done some research - but would really like to hear from others. Leaning towards RO and carbon based on EWG article (http://www.ewg.org/.../ewgs-water.../filter-technology). I think we would be best suited to something with its own faucet at our sink....See MoreReverse Osmosis Water Filter for entire kitchen area
Comments (4)No, and RO is not ever your first line of water treatment. It’s reserved for extreme cases only. It wastes more water than it treats. And it corrodes anything it touches. Talk with a water treatment company and have your water actually tested first. There is no point in wasting money and water on something you don’t need. A simple under sink filter system might be all you need. Or you might need a whole home system. But you only very rarely will need a RO system of any kind....See Moretxjoyce
12 years agoUser
12 years agoasolo
12 years agotxjoyce
12 years agoandy_c
12 years agobuckeyefieldsupply
12 years agowwu123
12 years ago
Related Stories
HEALTHY HOMEHow to Choose a Home Water Filtering System
Learn which water purification method is best for your house, from pitchers to whole-house setups
Full StoryKITCHEN DESIGNSmall Luxuries: Chill at Home With a Specialty Ice Maker
Get perfectly clear cubes — and never wrestle a tray again — with a freestanding or built-in ice maker
Full StoryGARDENING AND LANDSCAPINGHow to Make a Pond
You can make an outdoor fish paradise of your own, for less than you might think. But you'll need this expert design wisdom
Full StoryGREEN BUILDINGJust Add Water: Rain Barrel Magic
Take your rainwater storage from practical to beautiful with a new breed of design-friendly rain barrels
Full StoryLIFEHow Do You Make Your Tea and Coffee in the Morning?
A morning cup is a must for many, and preparation comes in many guises. We look at coffee and tea habits across the Houzz community
Full StoryLIFE10 Beautifully Simple Ways to Go Greener in the New Year
You may just find more green in your wallet along the way
Full StoryKITCHEN DESIGN20 Kitchen Must-Haves From Houzz Readers
We asked you to tell us your top kitchen amenities. See what popular kitchen features made the list
Full StoryMONTHLY HOME CHECKLISTSTo-Dos: Your February Home Checklist
Get busy indoors this month with some time spent cooking, improving air quality and prepping for spring
Full StoryKITCHEN SINKSEverything You Need to Know About Farmhouse Sinks
They’re charming, homey, durable, elegant, functional and nostalgic. Those are just a few of the reasons they’re so popular
Full StoryKITCHEN DESIGNStandouts From the 2014 Kitchen & Bath Industry Show
Check out the latest and greatest in sinks, ovens, countertop materials and more
Full Story
User