need info on buying a new membrane.

[yf1]

I'm looking to buy a new membrane. which brand is the best?

I have now 75GPD RODI with filmtec membrain. and I still have po4 at 0.07 or higher at 55PSI normal NYC tap water . as far as i understant the membrain should not allow "any" po4 to pass, no?

thanks

 

[KathyC]

Are you measuring your PO4 where the rodi water comes out or in your tank?

 

[yf1]

right out of the blue tube from rodi!
in my tank I suffer from 0.17... so one of the reason is the ATO, so I'm on the way to elimminate the PO4 one by one...

 

[KathyC]

Just had to ask..sorry! I figured you were in the right place

Did you buy the rodi used or have any idea when any of the filters were last changed? I think the membrane is supposed to last for 3 years (? anyone)...but all things being equal, all of the filters lives depend on what your water supply is like to start with.
If you don't know the age, it would probably be a good idea to change all of them so you have a true baseline of their age.
Buckeye Field Supply is a Vendor on here and their prices are reasonable..most places sell reputable cartridges for the units. What brand is your unit?

 

[yf1]

I have a 3 month old buckyey Field Supply RODI...
as far as buckyey thay are super great in teck suport.
but I still want know, wich membrane will do "the best job"

 

[noodleman]

i dont think any RO membrane can remove all the impurities 100%....do you have a DI canister attached too?

 

[yf1]

sure! its RODI

 

[KathyC]

I'd write to Russ at Buckeye and ask..he gives very straightfoward answers.

 

[yf1]

I ulready spoke to him, he is a great man. and says my tap water PO4 is to high for a normal RODI to remuve, so i should get a second DI stage.

but I want to know, if there is any membrane that will do a better job?
is buckyeye's membrane the most best membrane around?

 

[loismustdie]

RO is limited as to the PO4 it removes. The DI resin does that for you. I suggest buying better DI resin first, before you go spending more money on a membrane/dual DI chambers. I'm not going to bash a vendor, but there are better suppliers of better DI resin out there. The answer that you need another DI chamber is ridiculous.
When was the last time you changed your DI? IMO, in NYC, it should be changed every 3 months.

 

[yf1]

but there are better suppliers of better DI resin out there.

so can you please tell me were?

When was the last time you changed your DI?

its 3 months old, ran about 700G of production water. the color is not changed yet.

 

[Irisservice]

filmtec is one of the best, the di would be the best option to remove anything else

 

[yf1]

so now I need to know were to buy the "best resin?"

 

[yf1]

what about spectur pure membranes?

 

[loismustdie]

its 3 months old, ran about 700G of production water. the color is not changed yet.

change your resin. I sent a pm.

 

[yf1]

Thanks for the PM. I reply to you a PM

 

[noodleman]

sure! its RODI

lol didnt see the di part

 

[Bob 1000]

What do you use to test for PO4..Just curiuos...Because I think you probably use a meter to see PO4 after RO... And that scares me....I don't want to test mine because salfert say's 0, so I'll blindly except that... I have low PO4 in my tank that the denitrifier is holding there...
Of course I mean the Phosphate option on it not just nitrate...

 

[yf1]

I use the digital HANA.

 

[Bob 1000]

okay that's why... Thanks..I'll never buy one...