High ppm after new membranes

[messsy]

Hi all, got a little problem and hoping someone could give me some advice.

I have a 300gpd system (2x 150gpd membranes)

I've just replaced the pre filters, flushed and replaced the two membranes and flushed for an hour. My tds reading after membranes is 50ppm. My pressure is 55psi and with pump 65psi.

Before changing the filters my psi was 65psi without the pump. (This was on a single 100gpd membrane).

I'm hoping someone will know what to try to get these readings down

Thank you

 

[Smurf]

try backflush it some more as probably still has production chem residule left in the membranes

 

[messsy]

Back flush don't I need to pump 000ppm into the 'clean' outlet of the membranes?

Thanks smurf

 

[spruce]

Back flush don't I need to pump 000ppm into the 'clean' outlet of the membranes?
Thanks smurf

No. Run as normal and just open the flush valve which will be on your waste line.

I would carefully open each membrane housing and check that you have fitted it correctly. We put a thin coating on silicone grease on the 2 o rings to make sure that slide into their housing without rolling. Also a slight coating on the rubber seal around the membrane at the top.

The other thing to check is that you have connected all the pipes up properly. Do you have a waste going to pure pipe etc in error? The waste and pure connectors can become confusing.

 

[Smurf]

no just turn the lever to the flush posistion on the ro unit until.

So you know which way it turn the backflush lever on the ro look at the red hose/waste pipe and you will see it flow much fast when it's set to backflushing

 

[messsy]

It all setup properly with everything going to the right place but double checked all fittings etc. Just resat the membranes with Vaseline again and just running more water through the pre filters on their own just to rule out carbon getting to the membranes.

Will post up with my findings when I've flushed the membranes again and turned on production.

Thanks both /emoticons/smile.png

 

[Smurf]

No probs...let us know how you get on:thumbsup:

 

[messsy]

Coming out at 32ppm. Not a good day today /emoticons/sad.png

I'm going to leave it on production for an hour see if it does come down anymore

 

[Smurf]

It should come down to about 2 if you leave it long enough.

Make sure you protect it from frost if it's switched of outside unprotected. Best bring it indoors to be on the safe side

 

[spruce]

Take the pure outlet off each membrane housing and run the r/o for about 5 minutes. then collect a water sample from each individually and test the water purity. That will tell you if you have a problem with just one membrane.

Where did you get them from?

 

[Smurf]

Just wondering how could you tell doing that as they run inline not from seperate feeds

Take the pure outlet off each membrane housing and run the r/o for about 5 minutes. then collect a water sample from each individually and test the water purity. That will tell you if you have a problem with just one membrane.
Where did you get them from?

 

[messsy]

By taking the water from the outlet of each membrane will determine if one is knackered. It's running at 37 ppm now so next step is check which one has gone. It can only be one so will get a replacement.

They were brought from an eBay seller but a recommended one. I've messaged him and waiting for a reply from him.

I didn't know if to block the production line while flushing as water is still released, I googled but didn't find anything. I've fitted a tds creep adaption so when I flush or leave it standing I can isolate the resin and have 'dead production' water go down the drain. My thought with blocking this line is it would stop anymore baddies getting through the membrane and also produce some pressure back against the membrane. Any thought on that guys

 

[messsy]

73ppm and other is 65ppm. Not wasting anymore time on these bags if sh1te. Just messaged the bloke again so will wait for a reply, will cost me the same as a 40/40 if I throw any more water at it /emoticons/unsure.png

 

[messsy]

^^water meter^^

 

[messsy]

Ok I haven't given up cuz I can't let two membranes (even if knackered) beat me.

Tap water = 420ppm

Product water = 65ppm

Waste water = 850ppm

Why is the waste so high?

 

[spruce]

Ok I haven't given up cuz I can't let two membranes (even if knackered) beat me.
Tap water = 420ppm

Product water = 65ppm

Waste water = 850ppm

Why is the waste so high?

Something doesn't sound right.

How reliable is your tds meter? Is there another windiw close by that your could do a double check with?

Daqua do sell tds test fluid but the difference between waste in inlet tds is an issue. If your tap water tds is 420 which is high then I would guess your waste could be around 500. My waste is only about 20 points ahead of my inlet, although my inlet tds is not as high as yours.

 

[AJ windows]

From what I've read I would be looking at your tds meter as suggested above.

 

[messsy]

I've got two handheld TSS meters and a dm1 inline and all are saying the same thing.

The seller said he contacted his supplier and they said it was normal for these readings

Not happy