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UK Window Cleaning Forum => Window Cleaning Forum => Topic started by: Nick_Thompson on November 29, 2012, 07:21:37 pm

Title: Help needed in identifying membrane
Post by: Nick_Thompson on November 29, 2012, 07:21:37 pm
Men

Is there a way of identifying what kind of membrane my newly acquired 40 inch RO has from its housing?
 
My son bought it from purefreedom 2 to 3 years ago as part of one of their van set ups, but they weren’t able to inform me as to its identity from their customer records.

It does say on the housing that the maximum working pressure is 225 psi if that’s any help.

Thanks Nick
Title: Re: Help needed in identifying membrane
Post by: SB Cleaning on November 29, 2012, 07:23:48 pm
Any 40" ro should be ok.....

Could be wrong though!!! ;D
Title: Re: Help needed in identifying membrane
Post by: Nick_Thompson on November 29, 2012, 07:52:57 pm
What kind of membranes (HF4, HF5, are there any others?) were purefreedom supplying in their 40” RO’s towards the end of 2009, start of 2010?

Does anyone have one from that time period?
 
Nick
Title: Re: Help needed in identifying membrane
Post by: king marko on November 29, 2012, 07:56:48 pm
Can't you just slide it out from the housing and have a look which one it is ?
Should be on the membrane?
Title: Re: Help needed in identifying membrane
Post by: Nick_Thompson on November 29, 2012, 08:15:54 pm
Marko

Yes, I guess I could, but I was curious as to whether there was an exterior indication.

Are the 40”membranes definitely identifiable, because the 100 gpd membranes aren’t?

Nick
Title: Re: Help needed in identifying membrane
Post by: CleanClear on November 29, 2012, 08:31:27 pm
Marko

Yes, I guess I could, but I was curious as to whether there was an exterior indication.

Are the 40”membranes definitely identifiable, because the 100 gpd membranes aren’t?

Nick

All the ones i've seen have not been definatley identifiable.
Title: Re: Help needed in identifying membrane
Post by: Nick_Thompson on November 29, 2012, 08:57:29 pm
I appreciate that CleanClear.

I was thinking that they would most probably be unidentifiable.
   
Nick
Title: Re: Help needed in identifying membrane
Post by: king marko on November 29, 2012, 09:31:42 pm
When I last changed my membrane it had HF4 written on it
Title: Re: Help needed in identifying membrane
Post by: Nick_Thompson on November 29, 2012, 11:44:09 pm


Marko, you the man!

That settles it, I’m whipping it out over the weekend!
Title: Re: Help needed in identifying membrane
Post by: Spruce on November 30, 2012, 09:55:33 am
Nick,

The best way to buy a 4040 membrane is to look at your water supply, and not replace like for like. What suited the previous owner may not be suitable for you, even if you live in the same town with the same water supply.

It all about water pressure as to whether you choose an HF4 or HF5. Water pressure changes even within the same town.

See Alex Gardiner's advise on this recent post

http://www.cleanitup.co.uk/smf/index.php?topic=161381.msg1342866#msg1342866