Clean It Up

UK Window Cleaning Forum => Window Cleaning Forum => Topic started by: Paul erithwc on August 03, 2016, 08:47:17 am

Title: At what tds reading would you change your 40/40 ro ?
Post by: Paul erithwc on August 03, 2016, 08:47:17 am

At what tds reading would you change your 40/40 ro ?

Thanks  Paul

Title: Re: At what tds reading would you change your 40/40 ro ?
Post by: martin hulstone on August 03, 2016, 09:47:28 am

I change at 40-50

Title: Re: At what tds reading would you change your 40/40 ro ?
Post by: Paul erithwc on August 03, 2016, 09:59:36 am

Mine is at 60-70 out the ro and 360 before the ro

Title: Re: At what tds reading would you change your 40/40 ro ?
Post by: Ian Lancaster 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.

Title: Re: At what tds reading would you change your 40/40 ro ?
Post by: slap bash 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.