[bluesteve]

i ve just replaced my ro membrane on my 100 gpd and i replaced the three filters on it as well. i flushed the filters out for about 10 minutes before connecting up the ro unit.
 i ve been running the ro unit since about 2200 hrs last night and at the moment (1020hrs) im still getting about 68-70 ppm , i have nt connected my di resin cartridge. im pretty sure it does nt take this long to get down to
a much lower reading. the tap water is coming in at about 270ppm.
 Also does the ro membrane dry up if the packaging been left open?
cheers for any help and sorry if the topic has been covered but i cant seem to find the answers for these questions.

[KarlJones]

whats the TDS of the waste?

[bluesteve]

273- 274 ppm

[KarlJones]

flush the membranes for 30 mins, take some readings before you turn the flush off.

(my gut reaction is that the membranes are not getting enough pressure though but do the flush test anyway)

[bluesteve]

flushed it for 30 mins and im still getting the same reading, i ve got enough tap pressure and i have nt a clue whats going on

[Alex Gardiner]

The membrane will degrade if the packaging is left open.  This sounds like this is your problem.  You really need to fit a new membrane.

When fitting new pre-filters you need to flush them for about 3-4 hours before connecting back up to the membrane.

[peekeclean]

When fitting new pre-filters you need to flush them for about 3-4 hours before connecting back up to the membrane.

why is that alex?? iv just fitted new pre filters then just run the lot on my 200gpd r/o, R/Oman never said a thing to me about flushing.

My reading is 290 going in and 5 coming out thats with a booster pump,it was 17 befor i changed the filters and fitted a booster pump.

[Alex Gardiner]

'Better safe than sorry'.

Flushing the pre-filters helps to remove any debris in them which might otherwise clog up the membrane's surface.

[Wrekin C S]

Sorry to jump on your post but - I am having a reading of 15ppm I know as close to 0ppm is what I should be aiming for but is 15ppm ok? Whats the Max reading before changing filter etc?

Thanks
Andy

[Alex Gardiner]

What RO are you using, what is your input TDS and what's the best output reading you have had in the past?

[Wrekin C S]

What RO are you using, what is your input TDS and what's the best output reading you have had in the past?

I have the 300GPD RO which I bought from pure freedom couple of weeks ago - The TDS Input is 525ppm and the output is 20 - 22ppm - I have flushed the membranes also. The best reading was 0ppm but that was when I first got it and the input TDS reading then was 461ppm.

[Alex Gardiner]

If your input is 525 ppm then it is fairly miraculous to get an output TDS of only 15 ppm!  Does the unit have an inbuilt resin bead canister?  If so, this may be the reason that at first it was reading 000 ppm but now the resin will be exhausted and it has risen to the proper reading.  Personally, I would contact Pure Freedom and check with them.

[Wrekin C S]

I rang freedom and yep you were right they say change the Resin - they reckon its because of all the rain water we been having! - where is the best place to get resin?

Thanks
Andy

[Alex Gardiner]

If you use a lot then it is best to buy it in 25litre sacks, or if you use less then you can buy it 5 or 1 litre at a time. Most WFP suppliers do it mail order.

[Wrekin C S]

ok thanks v much - just bought some off your site