Fill time.

Discussion in 'Water Fed Pole Cleaning' started by AnMadraRua, Aug 29, 2014.

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  1. AnMadraRua

    AnMadraRua Member
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    I've started filtering water into my tank (350l) for the first time. It's taken 7 1/2 hours and it's only half full. My water pressure is reading as about 25 psi, is this normal?
     
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  2. spruce

    spruce Grand Master
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    You will really have to tell us what r/o you are using.

    You would also need to tell us what your waste to pure ratio is and also what your tap tds is.

    Initially I would say that 25 psi tap pressure isn't helping as that is rather low. But low water pressure doesn't always mean a dribble of water coming from the tap. Water pressure and water flow aren't the same thing, although they are related.

    If you are also experiencing a low flow and low pressure, then you will have to look for the cause.

    But if you have a reasonable water flow despite the low water pressure, then fitting a booster pump will help.

    But if you have bought a cheap 50GPD r/o for example, then putting a booster pump onto it will make very little difference as a tiny r/o isn't any good enough for full time wfp window cleaning.
     
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  3. AnMadraRua

    AnMadraRua Member
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    I bought a 600gpd streamline from the cleaning warehouse.

    How do I adjust the waste/water ratio?
    My TDS was 66 going in and 000 coming out and the flow of waste was a lot faster than the water going in to the tank.
    Thanks
     
  4. spruce

    spruce Grand Master
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    I hope someone will be along who knows these r/o's as I have no experience with them.

    But this system should fill your tank much quicker than it has so far so you will benefit with fitting a booster pump.

    On most systems the pure to waste ratio will be between 3 to 1 down to 1 to 1.

    On our old RoMan 450 GPD r/o we had a waste to pure ratio of 3 to 1 and this was achieved by a non adjustable inline restrictor fitting on the waste line. Some use the same tap as is used to flush the r/o. When the tap is fully open the water washes over the membrane flushing it to waste. Once the tap is partially closed (not completely closed) then water pressure builds up inside the housing forcing some water through the membrane and thus filtered. The waste water still flushes over the membrane to stop it clogging up with deposits.

    So start at the waste pipe and work back to see what Streamline use to restrict the water to waste.

    It might be an idea to get a couple of containers, 1 to catch the waste and the other to catch the pure. If you let them both fill up together for the same length of time you will get an idea of your ratios.
     
  5. AnMadraRua

    AnMadraRua Member
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    Cheers, I'll have a look.
     
  6. R055

    R055 Newcomer
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    Hi there, I have just purchased the same streamline 600gpd system as you and I have the same 25-30psi mains pressure. I'm predictably seeing the same results as you, how did you solve your low production rate? Was it a booster pump? If so which one did you get?

    Cheers
     
  7. Smurf

    Smurf Banned
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    Hi & welcome to the forum ro55 :thumbsup:
     
  8. Smurf

    Smurf Banned
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  9. J D

    J D Well-Known Member
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    Your TDS is great, ye lucky beggar ! Get yourself a cheap £20 booster pump from lidl (They come on sale several times a year) . You'll be laughing after that......
     
  10. Smurf

    Smurf Banned
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    25 psi seems way too low for the ro to work efficiently at a decent production rate. Also make sure there is no restrictions on the mains tap/pipework that you connect it to as flow rate is important too.
     
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