[easy clean]

hi all,

im looking into buying a 4040. currently running 2x150 gpd ro (ro-man) water in at 350-370, water out at 10-12, producing 1000 litres in 12 hours (dont ask me how, nobody can work this out, but it does)

what 4040 do you have? hf4, hf5
what is tds in and out?
how much water does it produce?

many thanks 

[krave]

Hf5 4040, Very new so may not be run in??

310 in - 8-10 out
45 psi after pre filters, Not boosted, 140 ltrs ph atm.

[pingu]

Hi...have got a HF5 reason I have around 50psi pressure so this membrane is very suited to that pressure.

TDS in is between 260 and 380 depending...and out between 12 & 6 then into 1st di vessel then into second di vessel...out at 0.

As for output...bit hard to say as the temps make such a difference.

If you really need more information give June at Gaps Water Treatment a bell....not a lot she cannot help with.

Cheers
Dave.

[Ian Lancaster]

Here you go:  I e-mailed June yesterday.  Below is my enquiry and her answer



 Hi,
>>
>> I'm baffled!!  So many different types of DI resin!  In the past I've
>> always bought "mixed bed", but I don't know if this is the best (and most
>> cost effective).  I need the right product to remove the remaining
>> dissolved solids from the water after RO. I need 2 25lt bags. Please
>> advise.
>>
>> Also: I have a pumped 40-40 (RO-man) which produces water at about 18-22
>> ppm from an input of circa 280-320ppm at 60+ psi on a 3:1 waste ratio.
>> Is
>> this about right?  I've had the membrane for about a year but I produce
>> about 7-8000lt of pure per week
>>
>> Thank you,
>>
>> Ian


Dear Ian,

Thank you for your enquiry.

With regards to your first question..... All DI resins are mixed bed resins,
and all tend to have a similar life span.  From our range we recommend the
ResinTech Mag DI mixed bed resin.

Your system looks to be running okay - it should be running with at least
70% to waste on a single membrane system so as long as the 3:1 is with 3
going to waste that should be fine.  Although you might hope for a better
tds with a pumped system we often find that it is the case that customers
only achieve about 90% -95%  - this is because although the pressure is
increased it does not necessarily pump through enough water for the membrane
to work efficiently.  In conclusion unless you've seen a dramatic rise in
your permeate tds over the last 12 months (bearing in mind that the cold
weather causes tds to go up and production to go down) I'd say it is working
within parameters.  It is a good idea to keep a log of the running figures
from your RO system so that you can see if your membrane is starting to
fail.  Membranes do tend to have a shorter life when used with a pump so it
is worth keeping an eye on.

I hope that answers your questions.  Should you require any further
information please do not hesitate to contact us.

Kind Regards

June Page

GAPS Water Treatment
10 Stock Close


Ps: My system produces water at the above quality at about 2000lt per 10hrs.