Clean It Up
UK Window Cleaning Forum => Window Cleaning Forum => Topic started by: Paul H on January 02, 2014, 12:13:09 pm
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afternoon
I produce water via a small 200 gpd RO unit and 10" DI vessel into 1000 ltr Tank...
my Tap TDS is 190
TDS before DI 48
TDS after DI is 0
just concerned at 48 reading before DI is HIGH
any idea
I don't use a booster BTW
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48 is really bad,
What make or how old are the membranes, do you change pre filters regular.
Also get a booster pump, makes a big difference.
As an example, i have a boosted 450 gpd ro and my tap tds is over double yours and my tds is 3 or 4 after the ro, so i dont bother using di anymore.
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For such a small RO there is little benefit from a pump, sounds like the membranes require replacement from your TDS that size RO should get you 10 TDS
DARRAN
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Do you know what your psi is?
How old are the membranes?
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Membranes / filters probably going on 20 months now..
PSI - have no idea just hooked up to a tap in my garage
after DI always 0ppm
Just had a bit time off so started looking at kit / set up etc..
the small DI vessel probably gets me approx. 200litres of pure before starting to read 1or 2 ppm
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200 litres pure isn't very much.
Go on eBay and spend a tenner on a psi gauge. Your pressure may be very poor,
48 is definitely higher than it should be out of ro. Your tds should be coming out at between 8-15 I would imagine.
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Get a 40/40 RO with 20" pre filters and a commercial booster pump .
Cheap and efficient once bought
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Membranes / filters probably going on 20 months now..
PSI - have no idea just hooked up to a tap in my garage
after DI always 0ppm
Just had a bit time off so started looking at kit / set up etc..
the small DI vessel probably gets me approx. 200litres of pure before starting to read 1or 2 ppm
If you're still on the original membranes/pre-filters after 20 months then there lies your problem.
Pre-filters require changing on a regular basis dependant on how much water you produce.
Otherwise the membranes get damaged by chlorine and blocked from limescale/sediment.
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If you are going to change you pre-filters/membranes, it could pay you to upgrade membranes to 150gpd ones and fit a small booster pump. This will increase water production (if needed)..
The pump boosts pressure to 90 psi
I did this with my old 300gpd unit, making it a 450gpd
My tap water is around 320-350 and after RO it's down to 14.
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my tds is 32 straight out of the tap!double DI gets it down to 000.nice and easy.
i feel for you guys with all the faffing about with RO s and membranes. ::)roll
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Get a 40/40 RO with 20" pre filters and a commercial booster pump .
Cheap and efficient once bought
any links or where from?
been looking at this http://www.vyair.com/scripts/prodView.asp?idProduct=96 also
Daz .. its not really that much of a faff TBH mate... when youre kit works! ??? ???
these are the things im sorting first and formost in 2014.. tweaking my overall set up..
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I don't know a lot about ro filtering but the word is it should bring it down to virtually 0 then the di acts as I final polisher
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I don't know a lot about ro filtering but the word is it should bring it down to virtually 0 then the di acts as I final polisher
I've read somewhere it should be 95% ... Then the DI polishes the final 5%
So on my 200 ppm tap water ... After the RO I should be around the 10ppm ...
I may be wrong but clearly my 48 after RO is wrong
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Paul with a tds that high you should change your pre-filters every 3 months which will help prolong the lifespan of your membranes .
Which is the most expensive part of an ro . Mike