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UK Window Cleaning Forum => Window Cleaning Forum => Topic started by: easycleaner on July 23, 2008, 05:11:33 pm

Title: Tap water tds
Post by: easycleaner on July 23, 2008, 05:11:33 pm

Hi, what tap water tds does it have to be before I can use a DI system only?
Mart

Title: Re: Tap water tds
Post by: Ian Rochester on July 23, 2008, 05:12:29 pm

Anything above 100 and you will be using resin at a rate of knots!

There was a calculation somewhere on here to work out how long resin would last a various

Title: Re: Tap water tds
Post by: easycleaner on July 23, 2008, 05:28:09 pm

Cheers Lionheart that was quick. Any one know the formula for working it out?
Mart

Title: Re: Tap water tds
Post by: alanwilson on July 23, 2008, 09:26:22 pm

formula is

20,000tds per litre of resin - its a rough guide.

for instance, tap tds 100ppm you would get 20,000/100 = 2000ltrs of water per litre of resin.

using 2 di vessels in line means you can use resin that is part depleted to take the tds down from say 100 to 50 before going into the second vessel - resin normally lasts twice to 3 times as long this way.

Title: Re: Tap water tds
Post by: Ian Rochester on July 23, 2008, 09:51:00 pm

Our tap water is near 300 ppm, we use 40" RO's, much, much cheaper in the long run

Title: Re: Tap water tds
Post by: JSMC on July 23, 2008, 10:02:04 pm

my TDS is 28 and will be using twin DI 11ltr tanks

Title: Re: Tap water tds
Post by: Nathanael Jones on July 23, 2008, 10:31:36 pm

www.cleantech.co.uk/tdscalc.htm