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UK Window Cleaning Forum => Window Cleaning Forum => Topic started by: M.c.s on March 13, 2025, 07:51:10 pm

Title: New membrane reading
Post by: M.c.s on March 13, 2025, 07:51:10 pm
I bought a new 40 40.  Membrane

I have the commercial pump  from freedom

Iam only getting reading  0012. Before di  From it
I have flushed it for 2 hours and ran it for 1 hour

How can I get it lower
Title: Re: New membrane reading
Post by: martinw on March 13, 2025, 08:28:47 pm
What is your input ppm? To lower you  might need to fiddle with valve to get it optimal for current temperature of water. No figures for waste vs product flow make it bit more difficult deal with.  Example if your running 50/50 ratio backing up valve and changing it to 60/40 will offer slight improvement. Some membranes struggle to get below 10 if input is high ppm. Alternative involves water softener as it tends to work better.
Title: Re: New membrane reading
Post by: M.c.s on March 13, 2025, 08:54:25 pm
I have fiddled with vale got 60 waste 40 pure

Input 375

I can cope with 0012
But I would like it lower
Title: Re: New membrane reading
Post by: Spruce on March 13, 2025, 09:49:31 pm
Quote from: M.c.s on Yesterday at 08:54:25 pm
I have fiddled with vale got 60 waste 40 pure

Input 375

I can cope with 0012
But I would like it lower

That's a 97% rejection rate. Not bad for your tap water tds. Let it settle down for a few days and hopefully/maybe it will get to 98%. I doubt you will get to 99% though.
Title: Re: New membrane reading
Post by: M.c.s on March 13, 2025, 11:41:07 pm
Alright

Cheers
Title: Re: New membrane reading
Post by: SB Cleaning on March 14, 2025, 07:43:39 am
It can take 24hrs or so to go down sometimes.
Title: Re: New membrane reading
Post by: M.c.s on March 14, 2025, 07:50:56 am
Cheers
Title: Re: New membrane reading
Post by: Scottish Cleaning Service on March 14, 2025, 08:19:04 am
What make is your membrane? 97% is good to begin with.
Title: Re: New membrane reading
Post by: Spruce on March 14, 2025, 08:45:45 am
Quote from: SB Cleaning on Today at 07:43:39 am
It can take 24hrs or so to go down sometimes.

This is what Doug from Daqua also says.