RO: new membrane, old prefilters, low pressure, high TDS.

cpucpu · 09/24/2016, 04:20 PM

Hi, this is my current setup in more or less its positional order.

-Prefilters: 1 sediment, 2 carbon blocks. Way more than 6 months old.
-"Y" to a Booter pump: I have it turned off, I'm not sure whether it stills increases pressure. And to a preasure gauge. (20-25 PSI while pump is off).
-ASO valve.
-RO membrane: Down filmtec 50 GPD. Just changed weeks ago.
-Inline carbon filter. Coconut.
-UV light. Not working.

TDS.
Tap: 650 to a little less.
After prefilters: 650 to a little more.
RO membrane direct: 560.

There are 2 issues:
-Hight TDS.
-Waters runs continiously to the drain while feed water line in open. I feel this is particularly bad bacause while drain water runs at full stream, clean water is just a few fast drops.
-Not an issue but I don't seem to locate the flow restirictor. I upload picture from top.

What are your thoughts?

Vinny Kreyling · 09/25/2016, 07:53 AM

That looks like a dual membrane system to me, so you need 2 membranes when you change them. Your PSI is too low without the pump, it should be around 80 with the pump on. Change all your filters to get set up correctly. The flow restrictor is in the waste line where it connects to the membrane housing and should be cut to a length that gives you a flow rate of 4 gallons waste to 1 gallon of good water. I would say it is on the 2nd membrane housing but not sure on a dual system.

xREEFINaintEZx · 09/25/2016, 08:44 AM

I can't tell if it's a dual or if that's the 2nd carbon... Becareful changing the membrane without changing carbon. Carbon catches chlorine. Chlorine kills membranes. After the membrane your tds should be around 4 and hopefully under10. Your waste to clean water ratio should be 1:4. 1 cup clean,4 waste. If you want to reduce waste water and your booster works you might want to check out "membrane staging". It will cut the "waste" in half but you will need at least 60-65psi.

Vinny Kreyling · 09/25/2016, 11:47 AM

We would need to see a picture from the front showing the filters to know more.

cpucpu · 09/25/2016, 11:50 AM

I pretty much inherited this device, and at some point it stopped working. There is no direct suppport from the manufacturer, so I've reading and trying fix it myself. There were and still are several flaws, I just replaced the feed water line adapter, it took ~45 days to arrive from china.

It's not dual membrane, it's dual cabon. In the official product page there's a front picture: http://www.mirage.mx/263/productos/l...res/hydrox-60/ behing the prefilters there is a vertical pump and 2 current adapters.

From the picture you can see the reject water comming out from the membrane (right side of) to the drain line (red tubing to the left).
My guess is there no flow restrictor connected, As I don't seem to locate it anywhere. May that cause non-stop or high flow drain? or pehaps the ASOV valve is defective but I'm confused.

Also i think the prefilters are somewhat clogged as the 20PSI seems to be way too little pressure. But still TDS comming out of the membrane is way too high, I just replaced the membrane like 2 months ago, and the system has been pretty much stand by ever since.

cpucpu · 09/27/2016, 12:45 AM

Buckeye Hydro · 09/28/2016, 02:10 PM

Your drinking water RO system also has a UV, a high pressure switch, and a low pressure switch - so it must have a booster pump.

You can do some re-configuring if you want to use this as part of an RODI system.

Feel free to give us a call when you are in front of the system if you want help getting it up and running.

Russ
513-312-2343

09/25/2016, 07:53 AM	#2
Vinny Kreyling Registered Member Join Date: Nov 2002 Location: Miller Place, NY Posts: 7,206	That looks like a dual membrane system to me, so you need 2 membranes when you change them. Your PSI is too low without the pump, it should be around 80 with the pump on. Change all your filters to get set up correctly. The flow restrictor is in the waste line where it connects to the membrane housing and should be cut to a length that gives you a flow rate of 4 gallons waste to 1 gallon of good water. I would say it is on the 2nd membrane housing but not sure on a dual system. __________________ 250 gallon mixed reef, 2 Reefbreeder's Photon V 2, Deepwater BLDC 12, DAS EX-3 Skimmer, MTC mini cal, 2-3/4" Sea Swirls, Aquacontroller & 6 Tunze pumps.

09/25/2016, 11:47 AM	#4
Vinny Kreyling Registered Member Join Date: Nov 2002 Location: Miller Place, NY Posts: 7,206	We would need to see a picture from the front showing the filters to know more. __________________ 250 gallon mixed reef, 2 Reefbreeder's Photon V 2, Deepwater BLDC 12, DAS EX-3 Skimmer, MTC mini cal, 2-3/4" Sea Swirls, Aquacontroller & 6 Tunze pumps.

09/25/2016, 08:44 AM	#3
xREEFINaintEZx Registered Member Join Date: Aug 2016 Posts: 119	I can't tell if it's a dual or if that's the 2nd carbon... Becareful changing the membrane without changing carbon. Carbon catches chlorine. Chlorine kills membranes. After the membrane your tds should be around 4 and hopefully under10. Your waste to clean water ratio should be 1:4. 1 cup clean,4 waste. If you want to reduce waste water and your booster works you might want to check out "membrane staging". It will cut the "waste" in half but you will need at least 60-65psi.

09/25/2016, 11:50 AM	#5
cpucpu Registered Member Join Date: Sep 2016 Posts: 21	I pretty much inherited this device, and at some point it stopped working. There is no direct suppport from the manufacturer, so I've reading and trying fix it myself. There were and still are several flaws, I just replaced the feed water line adapter, it took ~45 days to arrive from china. It's not dual membrane, it's dual cabon. In the official product page there's a front picture: http://www.mirage.mx/263/productos/l...res/hydrox-60/ behing the prefilters there is a vertical pump and 2 current adapters. From the picture you can see the reject water comming out from the membrane (right side of) to the drain line (red tubing to the left). My guess is there no flow restrictor connected, As I don't seem to locate it anywhere. May that cause non-stop or high flow drain? or pehaps the ASOV valve is defective but I'm confused. Also i think the prefilters are somewhat clogged as the 20PSI seems to be way too little pressure. But still TDS comming out of the membrane is way too high, I just replaced the membrane like 2 months ago, and the system has been pretty much stand by ever since.

09/27/2016, 12:45 AM	#6
cpucpu Registered Member Join Date: Sep 2016 Posts: 21

09/28/2016, 02:10 PM	#7
Buckeye Hydro .Registered Member Join Date: Sep 2006 Location: Cincinnati, Ohio Posts: 4,857	Your drinking water RO system also has a UV, a high pressure switch, and a low pressure switch - so it must have a booster pump. You can do some re-configuring if you want to use this as part of an RODI system. Feel free to give us a call when you are in front of the system if you want help getting it up and running. Russ 513-312-2343