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Tds Reading After Membranes


charlie tapper

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depends what you start with, it`s worked out in a rejection percentage, above 95% is good.....

 

 

so if you start with 100 your looking for 1ppm to 5ppm with a new membrane... that is 99% to 95%

 

 

other factors will come in to play like pressure at the RO and temperature.

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Hi Charlie

 

You haven't given us any detail with regards to what r/o it is. It can't be a Merlin r/o as that would be around 90% when new.

 

So IMHO your membrane/membranes probably need replacing. If you have one of those RoMan type r/o with several membranes, then it could be 1 membrane that is the culprit. I would try to identify it by coupling up each membrane to work individually and test each one. We were told (by Peter Fogwill) that these type of membranes should work at between 97 - 99% efficiency, anything less than that is wasting resin polishing the water off. This was our experience with a 450GPD 3 membrane r/o we had. Membranes worked at that effieceiency for 6 years before failing. We have now upgraded to a 4040 and that is working at 98 to 99% efficiency and its a year old now.

 

If they have been in for a while, then I would replace them all anyway.

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http://www.ebay.co.uk/itm/300-GPD-Reverse-Osmosis-System-/111057750862?pt=UK_Pet_Supplies_Fish&hash=item19db8ecb4e

 

i brought this one .

 

only had membranes that were in it for 5 months .

 

changed membranes from their shop . didnt bring readings down . still read 016.

 

brought some new membranes from a cleaning store . put them in yesterday brought readings right down to 008

 

so guessing their membranes were dodgy

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