RODI question

[Mechanic907]

im running an aqua fix barracuda with tds meter it is new I’ve run it for 30 min and my tds readings are as follows
Incoming 124
Rodi output 3-4 ppm
I have 50 psi running through the system
Is the 3-4 ppm acceptable ? I’m not sure how to get it down to the 0 reading.

 

[Brad Miller]

I believe that particular unit will only remove 90% of your incoming tds, which would put you at 12 coming out of the ro membrane, leaving the di mixed bed to remove the rest of what it can do.
Remember the 90% is after the first membrane then that water flows to the di bed resin.

Minimum water pressure is 40 and perform much better with 60 or so pig.
After the first 10 minutes or so it will be producing what it can, providing you forced all the air out and flushed the membrane well.

Tds of 0 is what your shooting for anything above that is considered undesirable in a reef tank.

That unit would be better suited for someone that lives in a municipality or city that would provide a much lower tds to them.

Choices would be to either get a unit that can do it with a better membrane that will remove 98 or 99 % of TDS to the di bed. Or you can add on to your unit with other canisters that would do the job

Check out the BRS rodi units.

I have 370 tds to my house and had to go with the BRS 7 stage 150 gpd pro unit that has 2-75gpd ro membranes and then goes through separate Cation, Anion and mixed di beds.

 

[davocean]

0 is prefered obviously, 3 would be max most would accept.
If it's brand new sometimes they show TDS on the initial few gallons, so now that you've run it a bit I'd check again.

 

[flooddc]

usually new filters take some run time before it drop down to zero.

 

[Alexreefer]

I believe that particular unit will only remove 90% of your incoming tds, which would put you at 12 coming out of the ro membrane, leaving the di mixed bed to remove the rest of what it can do.
Remember the 90% is after the first membrane then that water flows to the di bed resin.

Minimum water pressure is 40 and perform much better with 60 or so pig.
After the first 10 minutes or so it will be producing what it can, providing you forced all the air out and flushed the membrane well.

Tds of 0 is what your shooting for anything above that is considered undesirable in a reef tank.

That unit would be better suited for someone that lives in a municipality or city that would provide a much lower tds to them.

Choices would be to either get a unit that can do it with a better membrane that will remove 98 or 99 % of TDS to the di bed. Or you can add on to your unit with other canisters that would do the job

Check out the BRS rodi units.

I have 370 tds to my house and had to go with the BRS 7 stage 150 gpd pro unit that has 2-75gpd ro membranes and then goes through separate Cation, Anion and mixed di beds.

Agree on everything he said. Brs has high quality di resin and you can get a separate di canister for very little

 

[Mechanic907]

I believe that particular unit will only remove 90% of your incoming tds, which would put you at 12 coming out of the ro membrane, leaving the di mixed bed to remove the rest of what it can do.
Remember the 90% is after the first membrane then that water flows to the di bed resin.

Minimum water pressure is 40 and perform much better with 60 or so pig.
After the first 10 minutes or so it will be producing what it can, providing you forced all the air out and flushed the membrane well.

Tds of 0 is what your shooting for anything above that is considered undesirable in a reef tank.

That unit would be better suited for someone that lives in a municipality or city that would provide a much lower tds to them.

Choices would be to either get a unit that can do it with a better membrane that will remove 98 or 99 % of TDS to the di bed. Or you can add on to your unit with other canisters that would do the job

Check out the BRS rodi units.

I have 370 tds to my house and had to go with the BRS 7 stage 150 gpd pro unit that has 2-75gpd ro membranes and then goes through separate Cation, Anion and mixed di beds.

Ok I may look into that it would adding on another membrane accomplish the same thing? I’m running off of well water

 

[Mechanic907]

usually new filters take some run time before it drop down to zero.

I don’t think I’ve gotten even a full gallon of produced water yet so maybe I should let it run a bit longer

 

[Brad Miller]

If your on well water, I would highly suggest a BRS unit with the "water saver" add on, it will reduce your water down the drain significantly.
The production rate of your unit is not very good and has a really high ratio of product to waste water ratio.

Call BRS and talk to them, they will give you great advice and help you out.

 

[Hybrid Ken]

im running an aqua fix barracuda with tds meter it is new I’ve run it for 30 min and my tds readings are as follows
Incoming 124
Rodi output 3-4 ppm
I have 50 psi running through the system
Is the 3-4 ppm acceptable ? I’m not sure how to get it down to the 0 reading.

I second the BRS system.
I look at water as being the back bone of the tank so I went full out and got a 7 stage RODI unit from BRS. I do not know what the TD is going in from the city's water but coming out of the two membranes it starts at about 8 TDS then drops to a 3 after a few minutes. Coming out of the resin it is 0.

 

[Brad Miller]

Most well water pressure to your home will fluctuate from 30-50 psig witch isn't near enough to get good production rate and low tds water. And fluctuating pressure is not a good thing for any unit.
You will have to add a booster Pump...again, talk to BRS, they have all you need

 

[davocean]

I don’t think I’ve gotten even a full gallon of produced water yet so maybe I should let it run a bit longer

Definitely check again after you've run a few gallons.

I agree there are better options, but yours may get you by until you can buy a better quality unit.
If you see 0 I'd probably run it at least until you need new cartridges, and then think about an upgrade, but your TDS is pretty low, I'd bet you get 0 after running it a few gallons.

My TDS begins at 430 for example...

 

[Brad Miller]

Here's a pic of mine with a booster Pump up at the top set at 72 psig supply water pressure.

 

[Mechanic907]

Most well water pressure to your home will fluctuate from 30-50 psig witch isn't near enough to get good production rate and low tds water.
You will have to add a booster Pump...again, talk to BRS, they have all you need

I do have a booster pump as well, I will get with brs and get a more efficient system coming

Here's a pic of mine with a booster Pump up at the top set at 72 psig supply water pressure.

do you have the pressure switch installed in your system ? I do but I barely get 50 psi before the pump shuts off due to the pressure switch, I’m running mine into two large garbage cans with float switches to auto shut off glow to each container once they are full, sorry I dint have a pic right now

 

[Brad Miller]

I am installing a switch next week.
You should be seeing a 40 or so increase in pressure into your unit with a booster Pump.
The switches should be adjustable and maybe set it for about 40

 

[Hybrid Ken]

Here's a pic of mine with a booster Pump up at the top set at 72 psig supply water pressure.

I love my BRE 7 stage water saver, I had to make it mobile because I can't leave it in the office kitchen or my lab 24/7. We get 125 PSI at the plane due to having a 2" water main. The PSI before membrane runs about 60 to 70.


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