Which Ro/di booster pump?

[Maddlesrain]

Hey all!
I've had my rodi unit for quite some time (over a year or so) and the pressure has never exceeded 40psi, which I'm guessing is the cause of an extremely low product to waste water ratio. After doing a little searching, it seems that by increasing the psi I might be able to help this a bit. I was also thinking of adding a second membrane to my current system, which is a 4 stage from BRS (I Can't remember the GPD, but I want to say it was 75). To add the second membrane, I'll definitely need the booster pump, but would you recommend just starting with the pump to see if there's an improvement before adding anything else?

I'm looking at the
AquaFX Booster pump
Or
Aquatec CDP 8800 high flow Pressure boost pump 8852-2J03-B423 10

Anyone have any experience with either? I just want something that will do the job and last!

Thanks!

 

[stunreefer Verified Sponsor]

We use the Aquatec CDP 8800 in our office and love it. I know several vendors on R2R that use it as well.

I would not recommend adding a second membrane.

@AZDesertRat will have more for you.

 

[R_C]

I have the AquaFX and it work very well. Brings the PSI to 80 PSI with no problems.

 

[AZDesertRat]

The Aquatec 8800 is the gold standard of the industry and still built in the USA.

Your waste ratio is controlled by the flow restrictor, not by pressure. You can trim a capillary tube restrictor to whatever waste ratio you desire.

The two reasons to get a booster pump are to improve the rejection rate (removal efficiency) and to increase production if you require more than 75 gallons per day.

The first is a great reason since membranes are more efficient at higher pressures. You could raise a 94 or 95% rejection rate to 98 or 99%. This is significant since for every 2% you can improve the removal you double the life of your DI resin savings you lots of money in replacements and eventually surpassing the cost of the pump.

The second reason, increasing the GPD is also good if you want more water faster. No need for dual membranes either, a single 75 gpd membrane will produce around 135 gpd or more at 95-100 psi which is where I run mine. I had a dual membrane system before and sold it on favor of the boosted system.

Booster pumps and dual membranes ARE NOT water savers. Some will try and tell you they are but that's simply not true. The other two benefits are real though.

 

[Maddlesrain]

double post.

 

[Maddlesrain]

Thank you all for your replies!
It seems that although the pump won't be helping with what I'm worried, about it wouldn't be a bad investment. I think I might give one a try!
Where would I get a capillary tube restrictor/how do I install/run it in my system? I'm completely unversed in the workings of Ro/di units beyond the bare minimum so please explain in the simplest terms possible!
Thank you!!