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WGB

  • Posts: 312
What PPM reading do you change membrane at?
« 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??
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Spruce

  • Posts: 8465
Re: What PPM reading do you change membrane at?
« Reply #1 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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Success is 1% inspiration, 98% perspiration and 2% attention to detail!

The older I get, the better I was ;)

Smudger

  • Posts: 13438
Re: What PPM reading do you change membrane at?
« Reply #2 on: August 30, 2016, 09:27:49 pm »
Isn't tds that high illegal ???

But yes the example given is correct

Darran
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Never argue with an idiot, they will only bring you down to their level, and beat you with experience

james stanley

  • Posts: 243
Re: What PPM reading do you change membrane at?
« Reply #3 on: September 01, 2016, 11:51:41 am »
23 is fine m8 .... Look to change above 35 ...
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SeanK

Re: What PPM reading do you change membrane at?
« Reply #4 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.
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Arnold Palmer

  • Posts: 20800
Re: What PPM reading do you change membrane at?
« Reply #5 on: September 01, 2016, 01:41:40 pm »
95% efficiency.
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#aliens
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