only got a moment.... will think more deeply into this later..... me in class
butttttttttttt typically, the booster pump would go after the prefilters and prior to the membrane. One of the benefits is boosting the membrane pressure to 50-60 psi for rated efficiency.
bbl...
Butch
yw Gill, just follow the directions in the two links i listed depending on if its manual off (doubtful) or pressure switch equipped.
Ill check back later
---------- Post added at 01:50 PM ---------- Previous post was at 01:47 PM ----------
Great online resource for connection diagrams for various system types:
http://spectrapure.com/support_hud_addons.htm
...Im not sure why the vendor would do otherwise.... sorta puzzled by that....
Gill,
Personally, I would connect the soleniod and booster pump after the charcoal prefilters. This would prevent either from being exposed to chlorine. If you look at specrtrapure's connection diagrams they also follow this logic.
Im not sure why the vendor would do otherwise.... sorta puzzled by that, but either way wouldnt pose a problem except in long term pump/solenoid life.
I would leave the pressure switch where it is at.
Membrane pressure is what needs to trigger the pump.
So, other than these minor connection details.... is the system functioning correctly now?
HTH's
Butch
---------- Post added at 10:54 AM ---------- Previous post was at 09:20 AM ----------
Epiphany:
If they were using substandard charcoal filters, or were concerned about the use of..... I can see the logic.
Cheap charcoal filters can release quite a bit of particulates downstream,
ummm meh... leave it alone as is
Butch
Gill,
Personally, I would connect the soleniod and booster pump after the charcoal prefilters. This would prevent either from being exposed to chlorine. If you look at specrtrapure's connection diagrams they also follow this logic.
Im not sure why the vendor would do otherwise.... sorta puzzled by that
Butch
Booster pumps are typically shown after the sediment filter but before the carbon blocks. This is the configuration recommended by Aquatec (generally considered the best booster pump on the market). They make this recommendation so that carbon fines (dust) coming off the carbon block doesn't make its way into the pump.
We recommend placement of the pump AFTER the carbon block(s), and just after a smalll filter/ strainer:
Russ
---------- Post added at 08:40 AM ---------- Previous post was at 08:27 AM ----------
Butch,
Below is the diagram of my setup. It also shows the wiring of the booster pump and its accessories.
For those of you using a sytem that includes a DI stage AND a pressure tank:
Pressure tanks are intended for storing RO water where its not critical that the finished RO water reflects the full rejection rate of the membrane. Rejection rate = the percentage of contaminants (typically measured by EC and converted to ppm of TDS) the membrane does not allow to pass through to the purified water (a.k.a. "permeate" or "RO water").
So most residential scale membanes have a factory spec rejection rate better than 96%. Meaning that if your feedwater was 100 ppm TDS, your RO water would be 4 PPM or less.
Now, remember that RO membranes function based upon the difference in the pressure on the feedwater side of the membrane versus the pressure on the storage tank side of the membrane.
So for sake of discussion let’s say you have 50 psi tap water and your RO water goes to a 5 gallon bucket at 0 psi. So the membrane is operating at 50 – 0 = 50 psi net driving pressure.
Now, if you have your RO water delivered to a pressurized tank, when the tank is full it will provide pressure back against the membrane at 66 to 85% of the feedwater pressure, so 50 psi - ~38 psi = 12 lbs of net driving pressure. You can imagine what sort of rejection rate you’ll see at 12 psi.
So the TDS of RO water in a full tank will be higher than the TDS in RO water delivered to an atmospheric (unpressurized) tank.
So if you are using DI, that tells me you are interested in 0 TDS water. Which means you should also be interested in RO water with minimal TDS. Can an RODI system be plumbed and configured appropriately to include a pressure tank? You bet. It would deliver RO (not DI) water from a pressure tank to a suitable use, and deliver DI water (not from the pressure tank) to a different use. All this requires is some fittings/tubing etc and an understanding of how these systems work. We rarely see vendors on the auction web site with a grasp of this issue.
Russ