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Paul erithwc

At what tds reading would you change your 40/40 ro ?
« on: August 03, 2016, 08:47:17 am »
At what tds reading would you change your 40/40 ro ?

Thanks  Paul
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martin hulstone

  • Posts: 323
Re: At what tds reading would you change your 40/40 ro ?
« Reply #1 on: August 03, 2016, 09:47:28 am »
I change at 40-50
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Paul erithwc

Re: At what tds reading would you change your 40/40 ro ?
« Reply #2 on: August 03, 2016, 09:59:36 am »
Mine is at 60-70 out the ro and 360 before the ro
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Ian Lancaster

  • Posts: 2811
Re: At what tds reading would you change your 40/40 ro ?
« Reply #3 on: August 03, 2016, 03:01:53 pm »
Quote from: Paulwc on August 03, 2016, 09:59:36 am
Mine is at 60-70 out the ro and 360 before the ro

If the RO is working effectively the product maximum TDS from an input of 360 should be 18 (95%).  You should get better than this from a new membrane, depending on input pressure.  When the TDS rises to 36 (90%) the membrane is on its way out, or there's a fault in the plumbing somewhere.
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slap bash

  • Posts: 1366
Re: At what tds reading would you change your 40/40 ro ?
« Reply #4 on: August 03, 2016, 07:05:41 pm »
I did some research on a few USA sites and they say when a RO is unable to reduce the taps TDS to at least 10%  of the sample water its stuffed. So if your TDS is 320 like mine, it should reduce to 32 TDS or less then your Di become  uneconomical on resin. I would think its a guide.
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