Eating Up RO Membranes

[flyfisher2]

Update time!
I was sure I’d need to change my carbon filters by now.
Pre filters are turning brown but no significant drop in pressure.
TDS post membrane is 4-5 and holding.
No issues since having brought units indoors.

 

[Reef.]

Okay here we go…

What test kit is that and do we know what an acceptable amount of chlorine is in a reef tank?

I’m guessing as near zero as possible? I see your test starts at 0.2 is that ppm?

 

[flyfisher2]

This is a Salifert chlorine test. It does read at parts per million.I’m testing post RO carbon filters in order to determine the need for replacement. The RO unit has been up since mid July and producing a minimum of 60 gallons of usable water weekly.

 

[Woodyman]

This is a Salifert chlorine test. It does read at parts per million.I’m testing post RO carbon filters in order to determine the need for replacement. The RO unit has been up since mid July and producing a minimum of 60 gallons of usable water weekly.

Do you sample and test after each carbon housing or just after both?

 

[flyfisher2]

Do you sample and test after each carbon housing or just after both?

post membrane,after both, before the DI

 

[Woodyman]

post membrane,after both, before the DI

I figured that was the case, I didn't know if you had done any sampling/testing after the first one. My guess would be after all the water you put through it you might be getting some chlorine through the first housing, but that depends on your incoming chlorine and the capacity of that filter you installed.

No worries though that's what you have the second one for.

 

[flyfisher2]

Still holding. The pre filter is brown. No drop in pressure I can see
The post membrane TDS is now 3!
Was 5 when new. Is that unusual?

 

[Woodyman]

Still holding. The pre filter is brown. No drop in pressure I can see
The post membrane TDS is now 3!
Was 5 when new. Is that unusual?

Maybe a seasonal change in your water parameters. Have you compared the incoming TDS to what it was before?

 

[flyfisher2]

Maybe a seasonal change in your water parameters. Have you compared the incoming TDS to what it was before?

Hey Woodyman, happy holidays to you. Been awhile.
Yes,I checked and its about the same, 150 ish at the faucet.

 

[flyfisher2]

I'm not complaining! Just surprised. No complaints LOL

 

[Woodyman]

Hey Woodyman, happy holidays to you. Been awhile.
Yes,I checked and its about the same, 150 ish at the faucet.

It has! Happy holidays to you as well, thankfully everything is still working properly for you!

 

[flyfisher2]

I've been making alot of water

It has! Happy holidays to you as well, thankfully everything is still working properly for you!

Yes, the change over from out side to laundry room has made a huge difference. Best thing that we came up with. Can't thank you guys enough for walking me through the process.

 

[flyfisher2]

Just put up a new post asking for info on Royal exclusiv Supermarin 160. You know anything about it?

Royal Exclusiv Supermarin 160

 

[Woodyman]

Just put up a new post asking for info on Royal exclusiv Supermarin 160. You know anything about it?

Royal Exclusiv Supermarin 160

I got nothing! Sorry!

 

[KStatefan]

Still holding. The pre filter is brown. No drop in pressure I can see
The post membrane TDS is now 3!
Was 5 when new. Is that unusual?

A drop in water temperature will increase the rejection rate.

 

[Reef.]

A drop in water temperature will increase the rejection rate.

Think you mean will decrease the rejection rate, with a lower water temp.

 

[KStatefan]

Think you mean will decrease the rejection rate, with a lower water temp.

No. With a decrease in temperature rejection rate will go up and permeate flow will go down.

 

[Reef.]

No. With a decrease in temperature rejection rate will go up and permeate flow will go down.

with higher temps the membrane will reject more TDS, the rejection rate will increase not decrease.

 

[KStatefan]

with higher temps the membrane will reject more TDS, the rejection rate will increase not decrease.

That is not correct. Look at page 15 of the FilmTec manual.