[jikwan]

also output is slowed after DI
whats the point?

[JM123]

when did you last calibrate the tds meter?

its something most people never do but should be done every month or two.

[macmac]

But will it stay at 000ppm as the filters get used more?

tony

[pingu]

JM123 please check your hotmail.co.uk account.

[jikwan]

jm   i been using built in meter on RO  it says 000
ok ill bypass the DI and use handmeter and check

i guess all RO manufacturers say the same thing:
replace after 6 mths

my 3 filters i been using 8 mths 1st filter looked really blocked
output noticably reduced but still 000
tried sthing........used garden hose..............stick it in one end
of exposed coconut filter..........jammed my hand on the other end
few mins..........tight sealed hosepipe end........blew out a load of
green stuff............output noticably increased
but nowhere near if i were using a brand new one
when this 1st filter really gets blocked i might try using remaining 2 filters
on their own without the 1st filter+post the results

[DASERVICES]

jm how do you calibrate a hand held tds meter.

cheers

[jikwan]

mac-
my filters-(rom new) never waivered from 000
last 2 weeks i noticed output reduction but still 000
pretty green though

[Davew]

jikwan, you mentioned a hosepipe? did you use tap water cos if you did your meter should have fluctuated. I would have thought it very unlikely that you are getting zero from your ro alone. Sounds to me like the meter is not working at all?

[jikwan]

dave
sure....take out the 1st filter,jam a tapwater hosepipe and flush
reinsert filter to RO and filter water through RO system
gives 000

hell, if i had a highpressure airline.....could have blown a lot more out

[Davew]

Umm if you ran tap water through before your meter, tds would have shot up straight away your meter could read as high as 500 if your tap water was bad. Makes me wonder if your meter is reading anything at all. Could you borrow a meter from someone?

[darren73]

just letting u know jikwan i had an inline meter on my r/o which give a reading of 000,i trusted it for months and when i got a handheld meter the true reading was 004,im no expert but i wouldnt trust those inline readings

[jikwan]

i take the 1st filter right out of ro system
jam a pretty high pressured tapwater hose in one end
put the palm of my hand on the other end
and flush the filter from the inside
i dont take any meter readings untill i reinstall the filter
back into ro system
when all 3 filters are screwed on i take a reading
i found water output significantly greater than before
reading on inbuilt meter gives 000 just like before
about every 3 months i compare meter readings using
my handheld meter-theyre exactly the same

[john tomkins]

jm how do you calibrate a hand held tds meter.

cheers

I got some calibrating fluid from RO-man (342ppm) and at the back of the meter you just turn the small screw till it reads the 342ppm of the fluid, bit hit and miss to be honest, closest I could get was either 336 or 348, nothing inbetween :
Also depends on setting at the correct temperature 25 deg.

[Rob_B]

just letting u know jikwan i had an inline meter on my r/o which give a reading of 000,i trusted it for months and when i got a handheld meter the true reading was 004,im no expert but i wouldnt trust those inline readings

My inline meter used to read 106 x 10 (1060 tds). People couldn't believe how high my tds was. I've got a handheld one now and its around 450. I am assumming that the handheld one is right as it is a more realistic tds.

[Paul Coleman]

jm   i been using built in meter on RO  it says 000
ok ill bypass the DI and use handmeter and check

i guess all RO manufacturers say the same thing:
replace after 6 mths

my 3 filters i been using 8 mths 1st filter looked really blocked
output noticably reduced but still 000
tried sthing........used garden hose..............stick it in one end
of exposed coconut filter..........jammed my hand on the other end
few mins..........tight sealed hosepipe end........blew out a load of
green stuff............output noticably increased
but nowhere near if i were using a brand new one
when this 1st filter really gets blocked i might try using remaining 2 filters
on their own without the 1st filter+post the results

Pre filters should be changed at least 6 monthly if they are 20".  3 monthly if of the 10" variety.  Leave it too long and your membranes will be wrecked - an unnecessary expense that can be avoided.

[jikwan]

shiner, mines a 300 roman the instructions that come with it
say replace after 6 mths     its a 10in
very little is said about membrains
is your view an educated guess or what?
 maybe you tried my trick.....or similar, and got membrane
damage as a result

ichecked my inbuilt meter and handheld.....exactly the same

[Paul Coleman]

shiner, mines a 300 roman the instructions that come with it
say replace after 6 mths     its a 10in
very little is said about membrains
is your view an educated guess or what?
 maybe you tried my trick.....or similar, and got membrane
damage as a result

ichecked my inbuilt meter and handheld.....exactly the same

I used to have a 300 gdp like the ro-man one.  I wasn't aware about changing the pre filters and my membranes were wrecked after about 9 months.  The pre filters were 20".
I know now that the 20" ones are meant to be changed 6 monthly.  The info about changing 10" filters quarterly, I read on here some time back (it must be true as I read it on here       ).  The 10" info was not queried by anyone so I took it as true.
If you have product instructions to change them 6 monthly then it appears that what I read may have been incorrect.  Either way, 8 months is too long.

[Jeff Brimble]

 Either way, 8 months is too long.

Maybe it depends on the tds of your tap water.

[Pj]

Change 10" prefilters every 3 months max,  if your water starts high TDS, otherwise RO membrane is trying to filter what prefilters should have cleaned out and will break down the membrane quicker.

Hope that makes sense.

[d s windowcleaning]

i put mine through di even when ro meter says 000 you never no if a filter or filters will last the night . di resin gives a bit more security that your water will come out at 000