Buckeye Hydro

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    Water treatment/purification/Reverse Osmosis

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  1. Standard membrane sizes near yours are: 2521 (2.5" in diameter and 21" long), and 2540 (2.5" in diameter and 40" long). Hopefully your system uses standard-sized membranes. Russ
  2. Ha! Thanks for noticing!
  3. We can provide a auto back washing valve to fit your tank if you'd like - then you wouldn't have to change carbon out for years. Would pay for itself in short order. Russ
  4. Are you using a carbon tank, or carbon cartridges? There is significant variation in the chlorine capacity of carbon blocks on the market, and that difference is not always reflected in the price. In other words, if someone is not mindful they can end up paying more for a lower quality block. Although carbon cartridges are relatively inexpensive, as you begin to process higher volumes, and higher flows, a back washing carbon tank is more economical over time. NYC water has incredibly low TDS - it is almost RO quality in terms of dissolved solids. We have customers in that area with feedwater TDS below 30 ppm. Russ
  5. In the water treatment business, if we know what we want to remove from the water, and we know its concentration, and the intended flow (usually in gallons per minute), we can typically specify a filter to do the job. Carbon, regardless if we are talking about standard GAC or catalytic GAC, can be used to treat chlorine, chloramines, organics, and a few others. It doesn't however remove TDS. That's where an RO membrane comes in.
  6. The difference vary a bit depending on if we're talking about residential scale systems (generally less than 150 gpd or 200 gpd), or commercial systems (generally > 500 gpd). Although the quality of the filters is a critical difference, as you mentioned, there are lots of other differences as well. I'm happy to discuss in greater detail if there is interest. For Filmtec membranes, 24 to 50 gpd are 98% rejection, 76 is 99%, 100 is 98%. The 150 and 200 gpd at usually around 96%. When you jumps up to commercial membranes, and run them at the intended pressures, rejection is typically 98.5 to 99.5%. Some low end systems have a commercial membrane run at line pressure (meaning without a pressure pump). Expect lower performance in these systems in terms of recovery and rejection. Large (e.g., 80 gallon) pressure tanks are expensive. The 80 gallon pressure tank we carry is $740 - well more than what you'd pay for a good quality residential scale RO. A couple of things to note regarding pressure tanks: An 80 gal p tank won't hold 80 gallons of water. A good rule of thumb is about 50% of that volume will be air, 50% water. A higher proportion of that total volume will be water at higher shut off pressures. *RO water in a full pressure tank will not be as pure as RO water straight from the RO membrane. As the tank fills to exerts more and more back pressure on the membrane and the pressure available to purify the water ("net driving pressure") is reduced. The internal bladder (the part that eventually will fail) on large, good quality pressure tanks is replaceable - at a considerable cost savings over buying a whole new tank. Russ
  7. A you talking about a pressurized tank or an atmospheric tank?
  8. Our customers use RO water to proof.
  9. For our customers with residential scale systems (generally less than 200 gpd), the replacement filters are inexpensive enough, and a softener expensive enough that few buy the softener. For customers we provide with commercial RO's, the replacement filters get more expensive, and most with hard water opt for pretreatment with a softener (and a carbon tank appropriately sized to remove chlorine and or chloramines). Russ
  10. There is significant price variation on RO units, but I wonder if you are comparing apples to apples here. There are a ton of very low end units available for a very low cost, especially on ebay.
  11. We recently joined the forum to better learn what your members need in terms of water treatment and purification. Buckeye Hydro provides these services/equipment/supplies to a number of micro breweries and distilleries in Ohio and Indiana and we are interested in expanding our involvement in this arena. Looks like this forum does not have sponsors or otherwise engage vendors. Am I just missing it? Russ Romme www.BuckeyeHydro.com
  12. If we stick to the technical issues for a minute, here are some things that caught my eye: At 77F and 60 PSI that system will produce only 11 gallons in 24 hrs. There are RO membranes that produce water just as pure much faster, and at 50 psi rather than 60 psi. Looked thru the instructions - the system only has one prefilter - a combination sediment filter and carbon filter. Looks like the same cartridge is used as the post filter. You can do much better than this configuration. No spec's provided on this cartridge. No pressure gauge No TDS meter It uses old fashioned Jaco style fittings. No consideration for feeding an atmospheric tank rather than a pressure tank. Etc, etc. Russ
  13. We'll, we're a little biased in this regard. If we pointed you towards the vendor and systems we prefer, it would undoubtedly be considered a commercial post and I suspect the forum gods wouldn't like us advertising our business or products here! Russ
  14. What is it that you are filtering?
  15. I know this is an old thread, but the original post includes a timeless question that we typically answer for customers at least a couple times a week. If you check the specs on your RO membrane, you'll see something refered to as the "rejection rate." In many cases, the rejection rate will be something like 98 or 99%. This means that the membrane will "reject" (not allow to pass through to the purified water side) 98% or 99% of the TDS in the feedwater. If you do some experimenting with your TDS meter, you'll note that your sediment filter and carbon filter do very little to remove dissolved solids. So with your tap water at 400 ppm, for example, you can measure the water at the “in” port on your RO membrane 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, 75 gpd Filmtec membrane has a rejection rate of 97 to 99% (i.e., they reject 99% of the dissolved solids in the feed water). So the purified water coming from your 75 gpd membrane would be about 8 ppm (a 98% reduction). To test the membrane, measure the TDS in the water coming into the membrane, and in the purified water (permeate) produced by the membrane. Compare that to the membrane’s advertised rejection rate, and to the same reading you recorded when the membrane was new. Membranes also commonly produce purified water more slowly as their function declines. So if someone has feedwater of 50 ppm, and you have feedwater of 650 ppm, you'll see there is not a specific number everyone can shoot for - it all depends on the tds of your feedwater and the specs your membrane. Russ