What RODI unit?
- Thread starter DarrenCar
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DarrenCar
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I have a gauge on order so I can test the psi. I think I’m just going to start out with the 4 stage 75gpd value plus system and then build from there. A few weeks down the line I will have saved a few dollars and I can get the extra membrane and a booster pump. This seems like the best way to go about it in my mind..
The thing I don't like about BRS is they use a cheap plastic mount, I have a dual reactor from them and every time I take off the canister I can hear it make a cracking sound. seams just a matter of time before it breaks. The one I have from the Filter Guyz has a metal bracket though I'm not sure they are still around.
The Coralife RO has a solid powder-coated metal mount. 2 screws hold it to the wall, thus easy removal from the wall during replacements. Just something to think about, easy maintenance is key to any of my equipment. I use my waste water for the laundry, and a little Soda Ash, clean clothes.
BRS Rodi setups are mounted using a plastic bracket!? That seems pretty cheap?
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Your town or city likely produces a water report periodically which may indicate if they use chlorine or chloromine. Ours did not in the 2015 report but did in the 2017 report (chlorine only, thankfully).
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Guys - you don't need a second membrane to reduce the amount of waste water. I've posted this a 1000 times, but the myth still persists. In fact, with unknown feedwater quality, adding a second membrane plumbed in parallel without changing the flow restrictor is not something we recommend. We do this sort of thing all the time with commercial systems, but those require adequate feedwater treatment that we don't typically see with residential-scale systems.
Russ
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DarrenCar
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So how do you reduce wastewater without 2 membrane's ? Im a total newb to this.
Simply change your $4 flow restrictor to a tighter restrictor. Will take you all of 8 seconds to install it.
But be aware: the often cited recommendation for a 4:1 ratio is based on information from the membrane manufacturers. So if you choke that off by adding another membrane in series, of if the choke it off by just installing a tighter restrictor, you may shorten the life of the membrane.
Do you by chance have a water softener or naturally soft water ?
But be aware: the often cited recommendation for a 4:1 ratio is based on information from the membrane manufacturers. So if you choke that off by adding another membrane in series, of if the choke it off by just installing a tighter restrictor, you may shorten the life of the membrane.
Do you by chance have a water softener or naturally soft water ?
KStatefan
2500 Club Member
That recommended 4:1 ratio is not based of of water as low in TDS as yours I did not look it up but I think they are rated a 200-250 ppm and you are at 32-37. Unless your water pressure is low I would not worry about a pump. I would also suggest getting test strips to determine chlorine or chloramines. The data I receive from my water company is very out of date and I do trust them.
That's correct. With feedwater like that, you can get away with all sorts of things in RO configuration most can not. Your feedwater is almost RO water. And still... no need for a second membrane plumbed in series if you want to reduce concentrate flow.
Foothill Corals
Active Member
Why would one plumb a second membrane in parallel? Shouldn't it be plumbed in series if you are going to run a second?
If you plumb the membranes in parallel, each would have its own flow restrictor, and you would get product water twice as fast, assuming you provide adequate pressure and flow.
Foothill Corals
Active Member
I plumbed mine in series with one restrictor. It doubled the output and cut the waste in half. I still do not see why you would run them in parallel vs series.
crusso1993
7500 Club Member
@Buckeye Hydro - what if he or others do run a water softener? It is my understanding that running softened water through a RODI is easier on the filters. Is this correct? Any other info you can provide would be highly valued!
If you over-restrict membranes plumbed in series with no regard for the feedwater quality, there a pretty good chance you will shorten the life on the RO membranes. But if you have feedwater like the OP, no worries.
If you have soft, or softened water, then there is no hardness (primarily Ca and Mg) to come out of solution and deposit itself inside the membrane - when this happens we say "the membrane is scaled." With 0 hardness, yes, you can go much lower than 4:1.
crusso1993
7500 Club Member
Thank you!
My BRS value plus water saver unit is mounted on a metal bracket. Pretty sure all their RO/DI units are. Their reactors on the other hand, do have a plastic mounting bracket.
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