right I have a HF5 4040 to membrane, I ran it for two weeks making around 400l a day, my water pressure is 2bar and a flow rate of 12 lpm, my pure to waste is around 1-1 but slightly more waste, my tap water tds is around the 240 mark, after running for two weeks the tds never dropped below 32ppm after telling the Company I purchased it of that I thought there was a problem I was told that 2 bar was to low for the to membrane to work although the exact same RO I had replaced it with used to run at 12-13ppm, so I have purchased a booster pump which is now pushing 5bar and the tds is only 15 again waste 1-1 slight more waste surly the tds should be around 8ish now as it's still not lower than the old membrane which was 12-13 on 2 bar, any thoughts or help appreciated
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Do I have a faulty 4040 RO membrane
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doug atkinson
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You don't have a Brodex system by any chance
doug atkinson
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Membrane from the cleaning warehouse !
doug atkinson
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Couple of things you need to check as often enough back pressure can be the issue.
Check to see if the shaft is properly seated in the end cap as if not you will get untreated mixing with treated.
Check to see if you have mounted in correctly the white o ring should be the end of the inlet.
The white o ring check to see you have not twisted it whilst putting it in as it will have an effect on the back pressure.
Try taking out the membrane and re seating it back into the housing.
What pump do you have litres per minute and PSI.
Check to see if the shaft is properly seated in the end cap as if not you will get untreated mixing with treated.
Check to see if you have mounted in correctly the white o ring should be the end of the inlet.
The white o ring check to see you have not twisted it whilst putting it in as it will have an effect on the back pressure.
Try taking out the membrane and re seating it back into the housing.
What pump do you have litres per minute and PSI.
I've had the membrane out twice now to make sure and had no effect also replaced pre filter as was told to try that, the pump is the the warehouse water genie 4040 booster pump works great as its halfed the original ppm from before when only on tap pressure I just thought it should be running around the 8tds mark
doug atkinson
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One last thing check your TDS is okay.
I've had in the past a couple returned because a certain company tested them and said they were faulty. When we got them back and tested them they were spot on.
The fault was with their system and back pressure. Faulty waste valve.
How many litres does the pump do as this can also have a factor even if the psi is 100 or so.
I've had in the past a couple returned because a certain company tested them and said they were faulty. When we got them back and tested them they were spot on.
The fault was with their system and back pressure. Faulty waste valve.
How many litres does the pump do as this can also have a factor even if the psi is 100 or so.
Can't seem to find a flow rate, tds meter is fine as I have 2 and both give same reading the old waste valve was fine and have just replace with a new one to work with pump the old one had 1 hole drilled and new one has 2 holes drilled to cope with higher psi from pump both valves give same readings luckley I've still got the old RO membrane so think I will try re fitting that as that was running 25tds before I replaced it
doug atkinson
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At 2 bar when testing membranes we get around 94% rejection rate. The manufacturer specify that 24 hr flush is required to flush out the chemicals in the membrane.
Some membranes do actually take 24 hrs and some you can flush within an hour it all depends on how long they have been soaked in production.
Notify your supplier but try it out for a month and hopefully the ppm will settle down as flushing for 24 hours is costly if you are on a water meter.
One last thing to try is take out your filters for a couple of minutes and then run your system as these can sometimes restrict back pressure.
I would also change your gate valve to a non drilled one, you can pick one up from the plumbing centre. This way you have control of your ppm as at the moment you do not.
Some membranes do actually take 24 hrs and some you can flush within an hour it all depends on how long they have been soaked in production.
Notify your supplier but try it out for a month and hopefully the ppm will settle down as flushing for 24 hours is costly if you are on a water meter.
One last thing to try is take out your filters for a couple of minutes and then run your system as these can sometimes restrict back pressure.
I would also change your gate valve to a non drilled one, you can pick one up from the plumbing centre. This way you have control of your ppm as at the moment you do not.
I flushed it for about 16hr when I first got it and then run it for 2-3 weeks at 2bar and this is this will be the 3rd time at 5bar and it's still reading 15-16ppm I'll give it a week to see if it drops then I may aswell put my old membrane in as that was only 25 on 2bar and not 32, I'll get my self a undrilled waste gate my pure to waste at the moment is pretty much 1-1 is that about right thanks for all your help mate much appreciated
