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UK Window Cleaning Forum => Window Cleaning Forum => Topic started by: cameron on June 16, 2004, 08:04:14 pm

Title: What TDS?
Post by: cameron on June 16, 2004, 08:04:14 pm

Hi all,
Can anyone please tell me what TDS reading is USUAL from an RO system using twin 40 inch membranes, at normal tap pressure?
The reading I am interested in is the one after the membranes but before DI.
Regards,
Cameron

Title: Re: What TDS?
Post by: Craig_Mawlam on June 17, 2004, 12:58:39 pm

Cameron,

There are three main types of membrane fitted to 40inch RO housings. HR (High Recovery) HF (High Flow) UHF (Ultra High Flow), in general these membranes will reject 95-98% of Total Dissolved Solids. Therefore if your source (tap) water has a TDS/PPM (Parts Per Million) value of 100 then you should expect a permeate (product water) value between 2 -5 TDS/PPM from the RO. It follows therefore that if the source water quality is 300 PPM then the output permeate reading will be in the range of 6-15 PPM, if 400 then 8-20PPM and so on.

Hope this answers your question.

Kind regards
Craig Mawlam

Title: Re: What TDS?
Post by: cameron on June 17, 2004, 03:33:41 pm

Thanks for the reply Craig.
Exactly what I wanted to know, you've been a great help.
Thanks,
Cameron

Title: Re: What TDS?
Post by: Craig_Mawlam on June 17, 2004, 04:00:37 pm

You're welcome.

Craig