View Full Version : RO Unit DI Resin
keithboylan
01-04-08, 00:20
How often do you change resin in DI chamber
Around every 8 weeks as i do a water change of 220 liters plus top ups ect.
:)
what do you do with left over resin? ive just installed my new unit and have half a bag left?
keithboylan
01-04-08, 00:55
Keep it you will change it on a regular basis you will need to get some more I store mine in a zip lock bag like sandwich bag I just installed mine 4 weeks ago and changed resin twice already
I buy a massive amount in one go to limit the cost of shipping and makes the DI resin cheaper, just keep it dry and your be fine.
:thumbsup:
I change mine when my TDS readings starts to go up
Once a year, it doesn't need it more then that. It you do it more then that your wasting money IMO
Once a year, it doesn't need it more then that. It you do it more then that your wasting money IMO
I don't think you can really say anything like that, it depends on how much RO you make and what the TDS from your RO unit is.
Best to measure the TDS of your output and change the resin when you see anything other than zero.
Once a year, it doesn't need it more then that. It you do it more then that your wasting money IMO
I would never leave it this long, i wait to see when my TDS raises above Zero then i change it, if i left it that long i would have a TDS of around 8 to 10 at least.
:)
The Reef Master
02-04-08, 20:48
What he says
As the others, I change it when the output moves from 0 to 1 tds., rather than on a time basis. That is about every 4-6 months, unless I forget to turn the RO off for any length of time :o and use it up quicker.
my tds doesn't start to go up until that point. . You guys must have bad water?
my tds doesn't start to go up until that point. . You guys must have bad water?
Not really as mine goes through three pods before getting to the DI and at this point my tds is only around 8 so not really high i would say.
:thumbsup:
Zero is what your shooting for, my tap water is 12-20
Zero is what your shooting for, my tap water is 12-20
Just measured my tap water its 324:eek:
Change mine when TDS rises, works out about once a year.
I lived in another city and my tap water was 200ish, maybe Im just lucky where Im at?
first lot lasted about 6 months. tap water is approx 70 TDS
When output TDS rose above zero (actually read 3) time to change
i have to change mine really regularly, after approx every 500l i run through it, which could be every month depending on whether 1 or 2 water changes plus ro for the top up. Just got crap water i guess!
The biggest saver I found for DI resin is to dump the first couple of minutes of RO production after the membrane.
On my system the tds after the membrane rises to about 150 when I first turn on the unit then falls steadily over the next couple of minutes until it is under 10 tds. Only when it reaches this value do I pass the water through the DI unit and start collecting RO. This has at least doubled the useful lifetime of the DI resin.
I also use this start up time to flush the membrane as it seems to make little difference to the rise & subsequent fall of the tds reading. Rather than throw this post-membrane-but-pre-DI water away, I collect it and use it in the iron and coffee machine as 'filtered' water.
I have added a few extra taps to manage the startup configuration.
On startup, open C and close B until the tds after the membrane falls to less than 10, then close C and open B to collect RO post DI.
http://www.ultimatereef.net/uploads/ROtaps.gif
Thats clever Tony, good idea there, I change my resin when Tds hits 1.
damianandrew
27-04-08, 11:40
change mine when i get reading of 2 tds at the max
When output TDS hits 1, I change resin. One change in nearly two years so far.
On that basis I have enough DI resin to last until I am really, really old ..............
I choose more than 3 months although like most people I change it when the TDS reading goes above 0.
keithboylan
27-04-08, 12:25
Okay I set up this post to get an idea how my water was I do also change my DI when reading gets above 0 but I am getting less than a month out of a change so my water must be bad
The biggest saver I found for DI resin is to dump the first couple of minutes of RO production after the membrane.
On my system the tds after the membrane rises to about 150 when I first turn on the unit then falls steadily over the next couple of minutes until it is under 10 tds. Only when it reaches this value do I pass the water through the DI unit and start collecting RO. This has at least doubled the useful lifetime of the DI resin.
I also use this start up time to flush the membrane as it seems to make little difference to the rise & subsequent fall of the tds reading. Rather than throw this post-membrane-but-pre-DI water away, I collect it and use it in the iron and coffee machine as 'filtered' water.
I have added a few extra taps to manage the startup configuration.
On startup, open C and close B until the tds after the membrane falls to less than 10, then close C and open B to collect RO post DI.
http://www.ultimatereef.net/uploads/ROtaps.gif
And in photo format ....
http://www.ultimatereef.net/forums/showthread.php?t=215676
Alan.
daddio2003
27-04-08, 19:08
Havent changed in a year and still at 0 TDS, okay water is only 45 going in so that probably helps.
Okay I set up this post to get an idea how my water was I do also change my DI when reading gets above 0 but I am getting less than a month out of a change so my water must be bad
Hi,
What's the TDS reading before the DI resin?
Either you use a lot of RO or there's something wrong.....
Cheers,
Gavin :)
Anyone know of a decent place to order a bulk load of resin, need to order pronto, thought i had some spare but i haven't and TDS has crept up to 4-5
Cheers
Anyone know of a decent place to order a bulk load of resin, need to order pronto, thought i had some spare but i haven't and TDS has crept up to 4-5
Cheers
Yes i buy my DI resin in bulk from RO Man.
:)
I'll check out the prices, cheers, should of thought of RO man
Does anyone know if RO man offers discount for UR members, just that there's a discount code bit on the order form ?
Does anyone know if RO man offers discount for UR members, just that there's a discount code bit on the order form ?
I took it from the deafening silence that there is no discount :laugh:
Anyhow, have ordered bulk load, should do me alright for a while
I took it from the deafening silence that there is no discount :laugh:
Anyhow, have ordered bulk load, should do me alright for a while
Make sure you keep it dry when being stored.
:thumbsup:
I change mine when my TDS readings starts to go up
The way to go and for the price of a TDS meter ( about half the cost of a reasonable coral ) then everybody should have one IMO. :thumbsup:
Thank god my resin was delivered today, checked TDS last night and it had crept up to 5!
No wonder my glass has been turning green :(
The Reef Master
30-09-08, 19:33
Thank god my resin was delivered today, checked TDS last night and it had crept up to 5!
No wonder my glass has been turning green :(
That is still very low you know Chris, ideally 0 but up to 10-11 is still not too bad.
Is it ok to use a RO unit which does not have DI resin?
Is it ok to use a RO unit which does not have DI resin?
Yes but DI Resin helps polish the water so your TDS reading is Zero, unless you have really low TDS levels to start with you will not get Zero TDS without it.
I use a translucent DI chamber which allows you to see when the media goes off.
Had my RO unit for nearly 2 years and use about 70 ltr every 2 weeks. The TDS still reads 0 so I've not changed it.
Had my RO unit for nearly 2 years and use about 70 ltr every 2 weeks. The TDS still reads 0 so I've not changed it.
Really you either have a faulty TDS meter or your input level must be really low to not have changed your DI resin for two years :eek:
Really you either have a faulty TDS meter or your input level must be really low to not have changed your DI resin for two years :eek:
From memory the TDS input readings are between 50 and 90 spiking to about 140 every now and then (normally if I run the RO unit at weekends).
Do you know of a way to test the TDS meter?
Cheers,
Richard
6 mths, as the units only getting light use, (20 gal pw) TDS is still 0 at the 6 mth mark.
when the TDS requires me to
Alot depends on how often you are using your RO. Its got nothing to do with when if you only use it every couple of weeks for a gallon or so. Its its work load you have to consider..... Having a TDS meter to measure the in and out will show you when to change. if you see the out rising then stop water production and change DI. Also regulaly change your filters too and you must flush your membrane too. Another tip is to make sure you compact the resin into your chamber.
I run 2 units with a boost pump at 80psi. I can produce 100gal a day but I've timed the unit to produce just enough for my needs.
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