Ro Waste Water

Discussion in 'Water Fed Pole Cleaning' started by scrim it, Nov 19, 2013.

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  1. scrim it

    scrim it Active Member
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    Do you keep the waste water valve on half way while filling the ibc tank or how much should this be turned on while purifying water?
     
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  2. scrim it

    scrim it Active Member
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    I'll try again and word my question better. New to this and not sure I'm doing it right.Currently my tap water is 042.

    I purify it through the sediment and carbon filters, the 4040 RO (WASTE WATER TURNED FULLY OFF) and finally the di. From the di I run a hose straight into the van 350litre tank. It takes 1.5 hour approx to fill.

    I know I don't need a RO as my tap water is low but I got it with a lot of other equipment 2nd hand so took it anyway with the thought that the di will last longer.

    My question is do I need to have the waste water valve turned on when I'm filling my tank and if so, how much should it be turned.

    I tried it today and had the waste water valve turned on by a quarter. The ppm coming out of the waste water was 068. How can this be if the tap water is 043.
     
  3. Duncs

    Duncs Grand Master
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    i flush my RO for 15 mins prior to purifying my water by opening the waste water tap fully
    after 15mins i purify my water by fully closing the waste water tap
    the guys will be a long later to explain better
    if your readings are so low you could fill your tank from TAP then thro your DI
    thats what i would do RO takes ages
     
  4. scrim it

    scrim it Active Member
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    Thanks for the reply. The RO only takes 1.5hours to fill my 350lt tank. That's not too long as I can do it at night. So you never purify your water with the wate valve open a little? Do you fill your tank straight from the RO or do you fill a IBC tank first.

    It's just I hear people always saying about how much waste water an RO uses but I don't understand what they mean?
     
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  5. Duncs

    Duncs Grand Master
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    when i purify the water the waste water is closed
    the waste water still comes out the pipe tho
    i purify to my van this is ok if you are only using 350l
    but i have garden buts in garage 1000l tank would be better tho
    the waste water tap is only ever open when flushing prior to purifying
     
  6. scrim it

    scrim it Active Member
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    I will flush the ro before purifying from now on. There is no water commingled out out the room while I'm purifying. Should it be?
     
  7. Chimera

    Chimera Member
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    #7 Chimera, Nov 22, 2013
    Last edited: Nov 23, 2013
    If your RO system has a pre-set waste output and the saddle valve is used purely for flushing, see below. If not see Dougs post below.

    If purifying down from a high PPM (350+ I believe) there is some merit to leaving the waste valve slightly open (Less than a quarter turn) to ease the workload of the membranes making them last longer at the expense of of slightly more waste water.
    Regardless of input PPM it's worth flushing for 10 or so minutes before each use to prolong the life of the membranes.
    If purifying down from rain water you can recycle your waste back into your rain water storage butt until it's ppm reaches 75 at which point it must be emptied to start again (I've yet to have to do this mind).
     
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  8. scrim it

    scrim it Active Member
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    Thanks chimera. I will flush then keep valve closed.
     
  9. gto

    gto Active Member
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    no you need the waste valve open. at least 50/50 (depends on your RO)
    when you purify the waste is building up on the outside of the membraines, the waste water washes the waste particles off.

    with the waste tap closed you are forcing everything through the membraine, so the waste particles will block up the pours in the filter killing it.
    your RO wont last very long.
    with low TDS go with DI only or pay a lot to change membrains every couple of months.
     
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  10. jimmyboots

    jimmyboots Forum Addict
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    I do the same as Duncs. Open the waste when you start and take a reading of the water before it runs through the DI. by disconnecting the pipe. The reading will be high as it flushes any waste particles through.
    After 10 minutes or so the reading will drop as the filters run to their maximum efficiency.
    I then close the waste valve (waste water still comes out only less, as Duncs said) and connect the pipe back up to the DI and let the pure run through.
    This makes your Resin last longer as it never has to work hard reducing the TDS for the first 10 mins or so.
    My reading from the tap is 250. If it was 43 I would probably use just a DI. Either way with 043 tap water, if you flush your membranes for 10 mins prior to filling, your membranes, filters and DI will last forever :D
     
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