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UK Window Cleaning Forum => Window Cleaning Forum => Topic started by: s.hughes on July 27, 2006, 11:06:12 am

Title: Tds reading
Post by: s.hughes on July 27, 2006, 11:06:12 am

My tds reading is 10 and I have 200ltrs of it. Is this ok to use? Also one of my ro membranes has gone really green. When I change my resin I can bring the reading down to 0000 so does it matter if the membrane is green or should i look to change it?


Cheers
Steve

Title: Re: Tds reading
Post by: Jon T.C. on July 27, 2006, 11:58:56 am

What is your reading before and after the ro?

Title: Re: Tds reading
Post by: Paul Coleman on July 27, 2006, 01:15:15 pm

Quote from: How Much????? on July 27, 2006, 11:06:12 am

My tds reading is 10 and I have 200ltrs of it. Is this ok to use? Also one of my ro membranes has gone really green. When I change my resin I can bring the reading down to 0000 so does it matter if the membrane is green or should i look to change it?


Cheers
Steve

Must be an Ionics one.  Their filters have a habit of changing colour   :)
Sorry mods.  Couldn't resist it  :)

Title: Re: Tds reading
Post by: s.hughes on July 27, 2006, 03:25:49 pm

My tds reading is around 250 before r/o, after r/o its 175, then 0000 after d/i and when I have changed the resin.

Steve

Title: Re: Tds reading
Post by: JM123 on July 27, 2006, 03:37:12 pm

wow its reading 175 after the ro??  Change the membrane along with any prefilters etc that haven't been changed recently.  RO'd water should never be that high.

Title: Re: Tds reading
Post by: s.hughes on July 27, 2006, 04:58:41 pm

I live in a hard water area and the tds is ok once its gone through d/i.

Steve

Title: Re: Tds reading
Post by: steve smith on July 27, 2006, 05:05:04 pm

My TDS is 380 - 400 before RO and 9-10 after and comes out 000 after DI

Steve

Title: Re: Tds reading
Post by: batterbee on July 27, 2006, 05:28:19 pm

Hi,

Does seem like you need to change your ro membranes, my tds is around 390 before ro and around 6-8 after then after di 000.

John

Title: Re: Tds reading
Post by: JM123 on July 27, 2006, 06:28:46 pm

I'd definitely change the membrane

Title: Re: Tds reading
Post by: s.hughes on July 27, 2006, 06:32:46 pm

I've just flushed the system and tested the water after r/o, 025, so the flushing has definatley helped. To be honest I dont use my system much so I have never really flushed it out. Somethimg I shall have to do more off me thinks.

Steve

Title: Re: Tds reading
Post by: JM123 on July 27, 2006, 06:38:49 pm

What type of ro is it??

If its Ro-man type then I'd take the membrane out and rinse it down with pure water (that water at 10 will do) and make sure I give the housing a good clean out too, to remove any green (use gloves).  Finally I'd backflush it again 3 or 4 times for 15mins a time.  The reading should come down to about 2ppm providing the membrane isn't knackered.

Title: Re: Tds reading
Post by: s.hughes on July 27, 2006, 10:38:21 pm

Thanks I'll give it a go 1st thing.

Cheers

Steve