[windiewasher]

How do you know when they need changing?
My ppm is becoming very erratic so I presume the membranes need changing as I've changed filters.also how much are membanes 2 x 200 gpd.

[windiewasher]

Bump
Have 45 coming out of ro.
Then Di is very erratic.

[Stephen Dwyer]

I don't really know to be honest.  All I can say is that I bought my RO unit from Pure Freedom and they advised me to change them every few years which I assume means every 3 years.  I have just gone past the 3 year point this month but it seems fine so I'm not going to bother changing them just yet.  I do always replace the vertical filters every 6 months though. 

[steven ainger]

a little more info would help,
like, what make is the ro,
how old are the membranes,
has it always produced a high tds.
but 45 out of a ro is very high, sounds like they are knackered to me.

[edward1]

yes they are finished m8.
new ones are around 200/230 each
but dont buy the cheap ones that you see for 180/190 as they are not the same quality.

[windiewasher]

It's from vyair cost me 240 for the complete ro so not paying that much for membranes answer to next question too.

a little more info would help,
like, what make is the ro,
how old are the membranes,
has it always produced a high tds.
but 45 out of a ro is very high, sounds like they are knackered to me.

[Ian Lancaster]

yes they are finished m8.
new ones are around 200/230 each
but dont buy the cheap ones that you see for 180/190 as they are not the same quality.

That's for a 40-40 membrane.  A 200gpd should be around £30- £40

[andyM]

I had this happen on my Vyair RO about a month ago.
It turned out that I had restricted the waste output flow by mistake and the waste pipe had a kink in it.
Might be worth checking.

[windiewasher]

thanx for that m8

I had this happen on my Vyair RO about a month ago.
It turned out that I had restricted the waste output flow by mistake and the waste pipe had a kink in it.
Might be worth checking.

[windiewasher]

hod did you restrict the waste output because im thinking something simillar as it is flying out the ro compared to it used to.

I had this happen on my Vyair RO about a month ago.
It turned out that I had restricted the waste output flow by mistake and the waste pipe had a kink in it.
Might be worth checking.

[andyM]

I replaced the waste pipe on my mine ages ago. It is the same John Guest type plastic pipe but I needed a longer length than was on there because I wanted it to reach the drain outside the garge.
Anyway to cut a long story short about a month ago I had the same thing happen as what you have described, the TDS was rising up to about 50-65ppm before DI and the RO was producing a lot more water than usual.
I thought the membranes were knackered.
It turned out the waste pipe was kinked outside before entering the drain and was restricting the waste water outlet.
I only found this out because it ended up blowing the waste pipe off of the RO!
I don't know if you have got the same thing happening but just check your waste pipe to make sure and check the connection is tight on the RO.
 

[windiewasher]

ive noticed it is slightly dripping from where the waste pipe comes off the ro!

I replaced the waste pipe on my mine ages ago. It is the same John Guest type plastic pipe but I needed a longer length than was on there because I wanted it to reach the drain outside the garge.
Anyway to cut a long story short about a month ago I had the same thing happen as what you have described, the TDS was rising up to about 50-65ppm before DI and the RO was producing a lot more water than usual.
I thought the membranes were knackered.
It turned out the waste pipe was kinked outside before entering the drain and was restricting the waste water outlet.
I only found this out because it ended up blowing the waste pipe off of the RO!
I don't know if you have got the same thing happening but just check your waste pipe to make sure and check the connection is tight on the RO.
 

[SonOfFormby]

Here's one to consider

http://www.gapswater.co.uk/acatalog/RO_UltraTec_HF5_SERIES_-_Ultra_Low_Pressure_Membranes.html



or this one



http://www.gapswater.co.uk/acatalog/RO_UltraTec_HF4_SERIES_-_Extra_Low_Pressure_Membranes.html

1st one same spec is £290 on purefreedom

2nd one same spec is £209 on pure freedom

Or are these the low quality ones someone mentioned in an earlier post.

Might be worth asking pure freedom to price match

I know pure freedoms are good as I had my system fitted there 2 and a half years ago but ro is churning out 40ish now, raising resin costs.

Lee

[andyM]

Get molgrips and a spanner on the RO waste pipe connector Doctor Windows and tighten it up as much as you can (without stripping the thread).
Since I did mine it has been as good as gold.