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UK Window Cleaning Forum => Window Cleaning Forum => Topic started by: WGB on August 30, 2016, 02:14:57 pm

Title: What PPM reading do you change membrane at?
Post by: WGB on August 30, 2016, 02:14:57 pm

As above. I have a RO 40/40 and TDS reading is sitting about 023 just after membrane at, should i replace soon??

Title: Re: What PPM reading do you change membrane at?
Post by: Spruce on August 30, 2016, 05:34:34 pm

Quote from: Wayne B on August 30, 2016, 02:14:57 pm

As above. I have a RO 40/40 and TDS reading is sitting about 023 just after membrane at, should i replace soon??

You need to give us some more info. Tap tds? Membrane's age. How many liters a week you process, etc

For example, if your tap water tds was 750ppm, then 23 pure is still within the membrane' s spec.  ;D

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Title: Re: What PPM reading do you change membrane at?
Post by: Smudger on August 30, 2016, 09:27:49 pm

Isn't tds that high illegal ???

But yes the example given is correct

Darran

Title: Re: What PPM reading do you change membrane at?
Post by: james stanley on September 01, 2016, 11:51:41 am

23 is fine m8 .... Look to change above 35 ...

Title: Re: What PPM reading do you change membrane at?
Post by: SeanK on September 01, 2016, 12:04:21 pm

My 4040 membrane is working out at around £40 a year (6 years use ) so for me I change it when its costing me
more than £40 extra  a year in resin.
Go by costs not ppm count.

Title: Re: What PPM reading do you change membrane at?
Post by: Soupy on September 01, 2016, 01:41:40 pm

95% efficiency.