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UK Window Cleaning Forum => Window Cleaning Forum => Topic started by: paulp on April 06, 2007, 07:35:32 am

Title: tds rising
Post by: paulp on April 06, 2007, 07:35:32 am

tds rising on RO system. Have replaced filters and resin. but tds rising quickly. Please could somebody advise me. Thanks

Title: Re: tds rising
Post by: LWC on April 06, 2007, 07:46:31 am

whats your tds in? has that changed at all?

Title: Re: tds rising
Post by: ac_cleaning on April 06, 2007, 05:19:25 pm

Let the system run for a few minutes and the tds on the out should start to fall.
al

Title: Re: tds rising
Post by: paulp on April 06, 2007, 06:47:25 pm

i replaced all filters, and then the resin, the resin is in a blue canister??, the system was running at TDS 0.01 from the moment i replaced all filters, now only 1 week later it is running at 0.04 TDS. I regularly flush the filters out, ( once a week ). The RO system is only 6 months old?? thanks for any advise

Title: Re: tds rising
Post by: chris@c.m.s on April 06, 2007, 09:50:19 pm

If its a small ro system and di canister and you dont disconnect the di when starting the Ro untill the ro gets going properly it will be producing water sometimes at aprox 80 tds, with that going into a small di canister it will quickly kill of your resin, check out what you ro tds is before di on startup after not producing for a day you will be supprised, unless mine is faulty that is  ;)     

Title: Re: tds rising
Post by: Londoner on April 07, 2007, 07:55:12 am

Bear in mind it might be your membrane but don't change it just for the sake of it. Invest in an in line TDS meter if you don't already have one. Sampling with a hand meter is OK for checking your finished water but it doesnt let you know whats going inside the system.

Title: Re: tds rising
Post by: LWC on April 07, 2007, 08:03:40 am

hi, i had this problem when i started, i had the small blue vessel which you mention, i would have 000 for a week then it would shoot up to 014, i used to live in a very hard water area, so i bought one of these and got rid of the blue vessel

http://www.ro-man.com/shop/product_info.php?cPath=33&products_id=98

hope this helps, it did with me and i have yet to change my resin in over 6 months, although i do live in a softer water area now.

 ;)

Title: Re: tds rising
Post by: john tomkins on April 07, 2007, 08:40:49 am

I would say the same as LWC as was in my case, but seeing as you have obviously not had the problem in the 1st 6 months of use then....
1) You have been stop/starting the production more without disconnecting DI and  allowing tds to fall to low figures for the few mins, thereby killing resin quickly.
2) Your resin has not been kept well enough and not lasting as well as it did (I've had that problem).

Whats the tds out of RO figure, before DI?

Title: Re: tds rising
Post by: Alex Gardiner on April 07, 2007, 09:04:02 am

This could be your situation.

Your pre-filters started to 'go-off' therefore your TDS rose 'knocking' out your resin. You have changed your pre-filters and the resin. After changing your pre-filters it always advisable to disconnect the resin chamber for at least 24 hours to let the systems flush through first. As you didn't do this you knocked out your new resin and your new pre-filters have still have not settled down.

You will always notice that after changing pre-filters the TDS will rise for several days until fully bedded in.

To sort this turn your RO to flush, and allow to flush for at least 2 hours (overnight even better) then go back to production mode and allow to run for several hours. When TDS has stabilised then re-connect your Resin chamber with fresh resin.

Title: Re: tds rising
Post by: paulp on April 10, 2007, 07:31:31 pm

many thanks, flushed the system out and TDS back on 0, thanks again..