[Griffus]

Changed the RO Membrane last week as the TDS in the tank was coming out above above 50.

New Membrane in place, a good few pound lighter in the pocket, but the TDS is still 40+.

Tap water hovers around the 250 mark.

What have I got to do to get this down to around 20, which is what I'd hoped I'd easily achieve with the new membrane.

[dave0123]

are you using a booster pump?
what is your tap pressure?
what is the water flow from your tap per min?
what membrane did you buy?
what ro do you have?

[Griffus]

are you using a booster pump?
what is your tap pressure?
what is the water flow from your tap per min?
what membrane did you buy?
what ro do you have?

No
Never been a problem, good and strong although I haven't gauged it
Around 8 - 10 litres
http://www.thecleaningwarehouse.co.uk/20low-pressure-reverse-osmosis-membrane-933-p.asp
AXEON PVC RO Membrane Housing 4" x 21" (Champ 4021) (Brodex 250RO system)

[chez]

Did you flush it first for a few hours? I think it needs this first.

[Griffus]

Did you flush it first for a few hours? I think it needs this first.

First hour or so.

Still not great, in at 40.

Will take apart a bit later and reassemble but red0 the silicon grease on the seals.

Failing that it's a swap I think.

[Crystal-clear]

griffus it might be pressure ? also boosters are the way forward but try a good flush 

[C.C.S.]

is it me or there are more and more problems with new membranes.aren't they up to standard anymore?i had the same problem .only lasted 1 year before the ppm went to 50+ and before that i used an older one for a lot longer.