RO membrane

[zt444a]

Anyone have about a 75 gpd membrane they would sell? Just thought I would ask before ordering online.

 

[Fade]

Did you change your Di and if you did What was your tds.

 

[zt444a]

Did not change it yet, but I did go to Roy's and my little hand held meter is fairly accurate. So I am reading 13 currently on my system. I will change the DI resin tonight.

 

[Markk96]

what is your RO tds?

 

[DrBDC]

I have a 90 gpd you can have. It has about 1 month on it and I've tried to keep it moist since removing it.

 

[zt444a]

Thanks Roy. What time can I come by and pick it up? Might get off early today...

Howie

 

[zt444a]

<a href=showthread.php?s=&postid=12504064#post12504064 target=_blank>Originally posted</a> by Markk96
what is your RO tds?

I am not sure Mark. I need an inline TDS meter. The 14 TDS is what I have coming out and I am sure that the membrane is old too.

 

[Markk96]

14 coming out of your DI just sounds like bad DI resign. testing your TDS coming out of RODI only would let you know about your membrane. Mine is around 3 and 0 coming out of my DI.

I have 2 inline TDS meters one for Water in, RO out, DI first stage DI second stage.

 

[Letmegrow]

14 is pretty high for bad resin, but if it were any other componant you would be looking at atleast 100. Your resin must be REALLY bad.

Most membranes I have gotten 5 yrs out of.

 

[Nanook]

<a href=showthread.php?s=&postid=12509299#post12509299 target=_blank>Originally posted</a> by Letmegrow


Most membranes I have gotten 5 yrs out of.

The membranes I have are about 4 years old now too. The key is protecting them with prefilters.

 

[Markk96]

Usually the key is a two stage DI, and having 0 coming out of the second. 14 is not that unusual for bad DI if it has been ran alot.

 

[Nanook]

I have a four-stage Ultimate DI from Spectrapure and test the conductivity after the third chamber which still gives me some grace. On top of that, I have TDS readings pre and post RO membrane and post DI.

 

[Markk96]

<a href=showthread.php?s=&postid=12509480#post12509480 target=_blank>Originally posted</a> by Nanook
I have a four-stage Ultimate DI from Spectrapure and test the conductivity after the third chamber which still gives me some grace. On top of that, I have TDS readings pre and post RO membrane and post DI.

Most of us are not that special :rollface:

 

[Nanook]

 

[zt444a]

Well my membrane is two years old, and we don't have super great water here. I might could get a whole house filter, but that is in the future.

I will be thinking about that pre-filter though, or a second DI cartridge.

I did order a new membrane too.

 

[StupidsReef]

<a href=showthread.php?s=&postid=12509429#post12509429 target=_blank>Originally posted</a> by Nanook
The membranes I have are about 4 years old now too. The key is protecting them with prefilters.

I agree here. I change out my prefilter's 2 times a year. The micron filter goes the fastest. But I too run two DI chambers on my RO/DI unit. I find it cheaper to do this then replace 1 filter that cost more than the prefilter's. But I do NOT have a TDS meter either to check them I just change them. That and I buy the Nuclear grade color changing DI.

 

[zt444a]

I just recently changed the poly and the carbon block on the unit. I am changing my DI resin today, and the RO membrane should be in next week I hope.

Plus I am picking up some backups from JX Metal for the next change over.

Howie