Clean It Up
UK Window Cleaning Forum => Window Cleaning Forum => Topic started by: MNWC on July 24, 2008, 02:22:25 pm
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Right here we go
My tap water in to membranes is =345 @ 75 psi
Out of 1st membrane = 13
Out of second membrane = 16
Combined = 15
Out of first DI = 12
Out of second Di = 11
Changed both resin cannisters last night both reading 000
I have made 450 Litres of pure and the water in the tank says 002
Changed all three pre filters last weak !
has any body got any ideas ???
When i first started wfp the water out of membranes was coming out at 6. Membranes are about 2 years old
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How old is the resin and how has it been stored?
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The membranes are getting old mine did this changed the membranes and all was good again,
Try flushing the membranes for an hour or so first to see if that does the trick
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I wouldn't be so sure that it is the membranes, The tds from the ro is still quite low. The resin should last longer than 450 L before rising Di only people get more than that.
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How old is the resin and how has it been stored?
The resin is about 1 month old and kept in an airtight container in garage i got it from gardiners
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The RO seems to be working fine.
Resin should be OK as well. I would watch what happens over the next day or two looking to see if the reading our of the DI rises. In fact take a reading of the water out of the DI BEFORE it goes into the tank. I wouldnt worry about a variation of only 2PPM as long as it doesn't continue to rise.
Let us know how you get on.
Andrew
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how are you suposed to store the resin ? mine is in the bag (opened ofcourse) it arrived in , stored in my garage! will this be alright?
regards dale
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In fact take a reading of the water out of the DI BEFORE it goes into the tank. I wouldnt worry about a variation of only 2PPM as long as it doesn't continue to rise.
Its 011 out of second DI and started out at 000 yesterday at about 6 oclock when i changed them both so in the space of 450 litres its gone up to 011 !!!
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OOPS Sorry Marcus..I didn't fully read the figures in your first post.
Something is wrong.
Check the figures out of your RO again.
Andrew
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Its now gone upto 23 out of membranes ??? :o
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Diagnosing RO issues is a real pain :(
I suspected your TDS from RO was going up.
It could be:
1/ Tap TDS has risen a lot..this can happen temporarilly
2/ Tap pressure has dropped.
3/ Membranes are on their way out.
4/ (Long shot) Your TDS meter may be reading wrong.. have you got a mate near you with one to check yours?
I notice you said you changed your pre-filters very recently. I am going to do a thread about what to do when you do this.
Andrew
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cheers andy
How do you post pics on here ive been trying but to no avail ??
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I have a massive variation in my tap TDS. It seems to go higher in hot weather. (it can vary from between about 250 (cold) and 480 (hot). Is the tds of the water usually around the same or does it vary quite a lot?
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cheers andy
How do you post pics on here ive been trying but to no avail ??
Hit "reply" then look at the bottom of the window.. there is "advanced options" there... click that and you can browse your puter and attach 2 pics.
Andrew
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Here you go
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There has got to be something with your DI, I mean, RO should be fine, coming out at that TDS, the DI's do not polish the water somehow, 16 out of RO is very good, now that's what I get, but my DI vessel brings it down, question is, why does it not with yours?
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exactly and the second di in the pic is brand new !!
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Long shot again but are there any works near you on the water mains?
I have seen an RO literally with mud in it when there were works near the road where it was in. It also may have been a temporary but very high increase in tap TDS for some reason.. the increase in RO TDS output suggests higher tap TDS. You booster pump rules out drop in water pressure.
Andrew
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Surely if the tds out of the ro was 10 after two di`s it would bring it down to 000. If tds out of ro was 50 after 2 di`s it would still be 000 !? (for sake of argument)
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I see you have 2 x 700 ml DI vessels.
Between them they will take out around 30000 TDS.
At 23 out of RO you should get around 1300 ltrs pure. Bearing in mind your DI's are in tandem they will take out more TDS but I reckon the resin is now spent. I am pretty sure you have had a bad inrease in tap TDS for some reason.
I am pretty sure of this.
The only real way to see if it settles down is to replace the DI resin.
If the RO out reading keeps climbing your mebranes need replacing.
Andrew
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Thats was what I was thinking If the tds is 10 or 50 the resin should be able to bring the water down to zero but it just wouldn't last as long. As Tim said 16 out the ro should be fine so imo it points to the resin, As I said earlier DI only set ups cope with water with a higher tds than that and DI only users would certainly expect to get more than 450l before the tds started rising. Otherwise their costs would be through the roof. You mentioned you got it off Alex G maybe he might know. If your reading this Alex then please advise! Failing that try ROman tomorrow the ro is one of his units maybe he knows what the problem could be.
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would it be wise to get two more membranes ??
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Sorry didn't notice you had posted again Andrew. Is that right? The reason I ask is he wasn't getting the problem before it just seems to be now, Although the tds from the RO is higher than before is that difference in TDS enough to make such a difference to the resin?
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Don't you just love it when RO's play up :(
There can be nothing more frustrating. As Andrew has pointed out it could be a sudden surge in input TDS that has quickly shot the DI.
Another thing to look at is whether the second DI insert is properly seated/the seal ring not damaged in the canister as this could be allowing water through un-treated.
The other point is the TDS meter could be wrong (unlikely but you never know, mine has just died after 7 years! I think it needs new batteries).
Try checking the output from your RO again is it still 23 or has it gone back down?
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its all turned off now as i have enough for tomorrow ill get it going and let you know......back in a bit......
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Right Out of RO 016 out of first DI (blue one) 012 out os second DI (clear one) 010 :-[
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It is looking like you have had a duff lot of water through the systems which has spent your resin quickly, either that or the second filter housing is letting water past the resin insert.
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its brand new from cleaning spot what do i look out for
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Hm, do they come in cartridges or just normal fill it yourself? Because something is wrong with them, no doubt, wether it's resin is spent, or like Alex said, the seal isn't proper.
Personally Marcus, I think a proper DI vessel would get you a lot further.
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fill it myself
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its brand new from cleaning spot what do i look out for
Unscrew it, have a look at the seals top and bottom of the insert. Are they there? Is there any damage on them? Are they seated properly? It should be fairly obvious if there is a problem.
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marcus im using the same type ro unit as you are and have had a problem same last year i ended up covering my windows to prevent sunlight going direct on to the membrane chambers , looking at your photo it looks like you could be getting sunlight on yours . it worked for me so give it a go .
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marcus im using the same type ro unit as you are and have had a problem same last year i ended up covering my windows to prevent sunlight going direct on to the membrane chambers , looking at your photo it looks like you could be getting sunlight on yours . it worked for me so give it a go .
That's not the problem though, the RO works beautifully, it's what happens after the RO.
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hi
when you fill the di do you pack it in or leave any room in it.
ie. if you shake the canister can you hear it move around.
tony
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hi
when you fill the di do you pack it in or leave any room in it.
ie. if you shake the canister can you hear it move around.
tony
Ideally you should only fill the canister to about the 3/4 level. It also helps if every day or so you give the DI vessel a good shake to agitate the resin beads.
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I have probably used more resin than most people and can tell you it is pretty reliable no matter what you throw at it.
My guess is you have the wrong type of resin ie an intermediate one, or the RO was letting untreated water through for a while.
We get brown water now and again and suprisingly the tds is exactly the same as what it normally is,To get a surge in input tds there has to be some major catastrophe somewhere not just a broken main.
if you have to shake your DI it is pretty much exhausted anyway.
To start with i would change the resin in the last vessil (the one with 10 tds) and see what happens
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Just looked at the photos, your di vessils look tiny , they just dont look big enough to me even with an input of 16.
If i used one at 18 litre (36 times that size) it would only last about 2-3 weeks before it starded to rise with an input tds of 70, so i suspect yours would only last a few days anyway.