[Fieldsy]

I've just replaced 2 x 100gpd membranes from Daqua in my small 200gpd unit..................and had them running for two and a half hours. The resultant TDS before DI is 60 !!!!. I've taken them out, made sure they are seated ok, tightened all connections and resealed everything, but it still won't budge. Is this the norm. I filled up 3x25litre drums. i don't seem to remember waiting this long before for the water to settle....................or am I just impatient.

Yes, there is an 85psi booster pump on the system 

I've replaced them because my previous tds was 24, but that was after a year of use of the membranes. I expected these to be lower within a reasonable time??

Thanks

[formb]

Phone Doug @ Daqua.

He'll sort you out I'm sure.

[Fieldsy]

Have rung Doug, and said I should back flush the system , he wasn't sure how, neither am I. Had the water running nearly 4 hours and still on 57.

Any help please

[weetot]

Someone on here was on about how to backflush a system a couple of weeks ago, not sure if the answer was put up, but if you look back at previous topics from a about 3-4 weeks ago it may help you?

[Fieldsy]

I just thought I put new membranes in and away I go, obviously not

[Fieldsy]

Mine has an Auto flush valve ??............and still on tds 57 !!! after installing 2 new membranes.............anybody

[cat9921]

I've just replaced 2 x 100gpd membranes from Daqua in my small 200gpd unit..................and had them running for two and a half hours. The resultant TDS before DI is 60 !!!!. I've taken them out, made sure they are seated ok, tightened all connections and resealed everything, but it still won't budge. Is this the norm. I filled up 3x25litre drums. i don't seem to remember waiting this long before for the water to settle....................or am I just impatient.

Yes, there is an 85psi booster pump on the system 

I've replaced them because my previous tds was 24, but that was after a year of use of the membranes. I expected these to be lower within a reasonable time??

Thanks

Fieldsy I know this will sound stupid but is the system on backflush now , My RO still makes water when my RO is on backflush and the TDS is high  : if not then Change your filters and see if that helps

Adders

[john tomkins]

Enlarge the pic in this link and the blue valve needs to be closed to produce and open to flush
http://www.ro-man.com/shop/product_info.php?products_id=1664

[dmlservices]

I've just replaced 2 x 100gpd membranes from Daqua in my small 200gpd unit..................and had them running for two and a half hours. The resultant TDS before DI is 60 !!!!. I've taken them out, made sure they are seated ok, tightened all connections and resealed everything, but it still won't budge. Is this the norm. I filled up 3x25litre drums. i don't seem to remember waiting this long before for the water to settle....................or am I just impatient.

Yes, there is an 85psi booster pump on the system 

I've replaced them because my previous tds was 24, but that was after a year of use of the membranes. I expected these to be lower within a reasonable time??

Thanks

Fieldsy I know this will sound stupid but is the system on backflush now , My RO still makes water when my RO is on backflush and the TDS is high  : if not then Change your filters and see if that helps

Adders

when i flush membranes , i dissconnect feed to di, and run to drain , for this very reason.


daz

[Fieldsy]

there is no blue valve on my system, and yes it is disconnected before DI.

Its now been running for nearly 6 hours and still on 57. Put the old membranes back in and tds has dropped to 25, which is why I took them out in the first place !!!

Getting severely ****** off !!

[Darranvps]

Hi,
Are you sure you have put the membranes in the right way around?

[Fieldsy]

Most Definately 

[Darranvps]

You have the brine seal at the right end ?

[Fieldsy]

Yep, what doesn't make sense is that putting the old membranes back in results in the tds going down ??, Using the new ones, shoots up to 57. I assumed membranes from daqua would be ok...........and I honestly can't believe both are faulty ??

[john tomkins]

you could try isolating each membrane to see if one is giving a high figure and is knackered.

You say you are getting 57 but that is both combined , you could be getting 14 out the one and 100 out the other giving a combined reading of 57 if you see what I mean

[Fieldsy]

yh, thanks John, I tried that, one is 53, the other is 68   

I'm also suspicious that other membranes arrived sealed and wet, as though they had been tested. These arrived sealed but bone dry, would that make any difference ??

[john tomkins]

I'd get back on to him tbh, think you have flushed them enough to be way lower than they are now.
Good luck

[Fieldsy]

Thanks 

[Darranvps]

They should not have arrived dry. I would speak with whoever you bought them from.
There is a company called Fileder in Kent - and I think they supply a lot of the resellers, perhaps you could go to them directly in future.

[Dave Willis]

Normally they arrive and the bag is vacuum sealed. If the bag around them was loose it could have been punctured allowing the membrane to dry out and deteriorate?