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Tds reading 17
- Thread starter gaz
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doug atkinson
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Gaz take a reading from each membrane. You may find one is at fault
doug atkinson
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I presume you put in 3 new membranes and got a reading of 18 from all 3.
If so then put all three in, flush the system for about 15 mins the close the flush. Disconnect the pure hose going into the T Piece which you then should be able to take a reading from all 3 membranes.
My tds reader died on me, awaiting new one tomorrow I'll update u what happens, bit unsure how to test each membrane so gunna leave 2 old membranes In and keep swapping the 3Rd with a new membrane see if the 3 overall readings are different. Example I get 5 another 5 then a 20 then I know it's the 3Rd one what's problem
Iurie
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May I ask you - if you see any visual difference between 150 GPD membrane and your old one ? I mean they look the same , weigh the same , same size ...
Usually I get 75 or 100 gpd and can't see any difference visually or in the amount of water they produce
No, as Doug says, put all the new membranes in, flush your system and then run it as normal for about 5 minutes. You will see all the pure pipes are joined together before they head off to your di/storage tank.
Each of those pure pipes will be joined together with a JG T piece. You will be able to remove each pipe from each housing and collect a pure sample from each. Collect a sample from membrane no1 and then test it. Collect a sample from membrane no2 and then test that. Do the same with membrane no3.
With those readings you should be able to identify if you have a 'faulty' membrane and which one it is.
Right guys 3 old ones read 5 or 6, very slow. I tested 1 new one with 2 old ones, the reading on 3 separate occasions with the 3 different new membranes was 9. So it seems there is no dodgy one. I then retested the 3 new ones all together and it now reads 11 not 17 and above ad it did other day, I am now happy with this reading, they are much faster.
In regards to comparisons between 100gpd membrane and 150gpd membranes I've had both in past, both same size physically and I'm not sure if I got any more water production from the 150s, I couldn't tell really, next time I'm getting 100gpd as my unit is off at times
In regards to comparisons between 100gpd membrane and 150gpd membranes I've had both in past, both same size physically and I'm not sure if I got any more water production from the 150s, I couldn't tell really, next time I'm getting 100gpd as my unit is off at times
David K
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I Can go for ages without changing my 11l DI vessel, and i have about 15 ppm from RO unit . Maybe even 6 months.
David K
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I Can go for ages without changing my 11l DI vessel, and i have about 15 ppm from RO unit . Maybe even 6 months.
As per @daveyboy.
Also the spec per day = 24 hours and the gallons are US gallons which are about 4 liters.
Yours is doing better than ours did. It took about 28 hours in winter to fill an IBC tank with a little water in the bottom that couldn't be sucked out with the transfer pump. So estimated that it would take 36 hours in the winter to fill it from empty.
This is why I believe that the bare minimum for a single cleaner is a 300 GPD and that would probably run near enough all day and all night keeping up with daily usage. A 450GPD will give a single operator enough water with a bit to spare.
We struggled with 2 cleaners and our 450GPD r/o.
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