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  1. #1
    Senior Member Rank = Jussai RS2OOO's Avatar
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    Water Supply flow rates

    Just carried out a 1700 litre water change.

    Turned the hose on at 14:45 and achieved 1700 litres at 18:50, so for arguments sake call it exactly 4 hours.

    Works out at 425 litres per hour, or 7.08 litres per minute.

    Water flows faster from my outside tap than it does from the kitchen sink tap (which is fed directly from the incoming supply), and at the end of the 80 feet long standard hose pipe it only flows only marginally slower than the kitchen tap so I don't think there's any issues with my internal pipework.

    I just feel that is too slow but don't have anything to compare against so would like to compare to what other people achieve through a hose pipe.



  2. #2
    550 litres per hour for me

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  4. #3
    Could your cold tap be blocked slightly with the muck in the hard water RS?

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  6. #4
    Senior Member Rank = Sansai Simon Fish's Avatar
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    Water companies have a requirement to supply at only 1 bar. But depends on where you live, could be anything from 1-10 bar.
    Flow is related to pressure but not the same.
    If your supply is 15mm or 25mm, there will be a difference.

    Most new kitchen taps are for high pressure, if it's got an isolater there's further restriction.
    Last edited by Simon Fish; 18-04-2019 at 09:55 PM.

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  8. #5
    I don't really have any issue with water pressure, but am interested to know how much water I should be flowing through my hose pipe/carbon filters. I have a flow meter I shall be fitting tomorrow.

    Not on a meter so have a constant flow going as my tap KH is low.

  9. #6
    All this talk of water, flow rates and pressure is making me want to have a pee

  10. #7
    Quote Originally Posted by kikokuryu John View Post
    I don't really have any issue with water pressure, but am interested to know how much water I should be flowing through my hose pipe/carbon filters. I have a flow meter I shall be fitting tomorrow.

    Not on a meter so have a constant flow going as my tap KH is low.
    John,

    There isn't a set flow rate that you can put through a purifier cartridge in order to guarantee full dechlorination. The maximum rate through a cartridge depends very much on the level of chlorine and/or chloramine in the supply and the only certain way to ensure the water is properly dechlorinated is to measure the output.

    The way I would suggest you set your flow rate is to begin with a trickle of, say, three litres per minute and check whether it is fully dechlorinated using the DPD 4 test I describe on my website on the link below.

    If the test shows that there is no chlorine/chloramine you could increase the flow rate a little if you wish or, if there is still a trace of chlorine/chloramine in it at 3 L/min, you should decrease it slightly.

    In short, bugger about with the flow rate and keep testing it until you reach a rate that that you are happy with and which gives a clear test.
    Questions Answered

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  12. #8
    Also once you have found a decent working flow rate as Manky described it's worth checking for Chlorine regularly as some cartridges don't last as long as you think they do specially if you are maxing out the flow rate and pushing too much crap that's in your mains incoming water through them each time you use the cartridge filter.

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  14. #9
    Quote Originally Posted by Manky Sanke View Post
    John,

    There isn't a set flow rate that you can put through a purifier cartridge in order to guarantee full dechlorination. The maximum rate through a cartridge depends very much on the level of chlorine and/or chloramine in the supply and the only certain way to ensure the water is properly dechlorinated is to measure the output.

    The way I would suggest you set your flow rate is to begin with a trickle of, say, three litres per minute and check whether it is fully dechlorinated using the DPD 4 test I describe on my website on the link below.

    If the test shows that there is no chlorine/chloramine you could increase the flow rate a little if you wish or, if there is still a trace of chlorine/chloramine in it at 3 L/min, you should decrease it slightly.

    In short, bugger about with the flow rate and keep testing it until you reach a rate that that you are happy with and which gives a clear test.
    Questions Answered


    I've never checked this before, I shall do so.

    I used a Viar 3 cartridge setup for a few years and never seemed to have any issue that I know of. At the end of last year I switched to a large 4 cartridge system.


    Thanks J

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  16. #10
    Senior Member Rank = Jussai RS2OOO's Avatar
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    Been doing some tests at different times of day / night.

    The outside tap is the fastest in the house (only marginally faster than the kitchen), and the time it takes to fill a litre of water varies between 10 seconds and 6 seconds, but usually around 8 to 9 seconds.

    This equates to between 360 and 600 litres per hour, which I guess is within accepted tolerances.

    The highest I can achieve at the end of the 80ft hose (laid flat) is 7 seconds per litre and the average is around 12 seconds per litre which equates to between 300 and 514 litres per hour.

    So it seems I'll just have to put up with waiting 4 hours for a typical 1700 litre partial water change (that's around 14-15% pond volume).

    Just seems odd that next door's (who isn't on a meter) hosepipe produces double the flow mine does.

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  18. #11
    Quote Originally Posted by RS2OOO View Post
    Just seems odd that next door's (who isn't on a meter) hosepipe produces double the flow mine does.
    Are you sure it's a meter and not a pump your neighbour has RS? LOL

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  20. #12
    Senior Member Rank = Jussai RS2OOO's Avatar
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    Quote Originally Posted by Frimley Koi keeper View Post
    Are you sure it's a meter and not a pump your neighbour has RS? LOL
    She's got no pump..... I've already looked at ways of cutting into her supply lol!

    Not sure if this makes any difference, but we are Semi detached but on a different street to our neighbour. Our neighbour's house is at the bottom of her street but we are at the top of our street.

    I wondered if we could be on different supplies, as it is common for the houses at the top of a hill to have much lower pressure than houses at the bottom.

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  22. #13
    Quote Originally Posted by RS2OOO View Post
    She's got no pump..... I've already looked at ways of cutting into her supply lol!
    Have you not seen those valve things that clamp round a pipe then have a section that screws into the pipe to tee off a live water pipe?

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  24. #14
    Senior Member Rank = Jussai RS2OOO's Avatar
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    Come to think of it, I actually have one of those in my shed!

    Sent from my Pixel 2 using Tapatalk

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  26. #15
    Quote Originally Posted by RS2OOO View Post
    Come to think of it, I actually have one of those in my shed!

    Sent from my Pixel 2 using Tapatalk
    Your shed is like an Aladin's cave RS lol

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  28. #16
    Senior Member Rank = Sansai Simon Fish's Avatar
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    Water meters will have a maximum flow through them, it will depend on the meter.

    20 lt/minute would be a fairly decent flow rate.
    So yours is a bit slack.

    If its trickled in through a carbon filter what's the rush?

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  30. #17
    Quote Originally Posted by Simon Fish View Post
    Water meters will have a maximum flow through them, it will depend on the meter.

    20 lt/minute would be a fairly decent flow rate.
    So yours is a bit slack.

    If its trickled in through a carbon filter what's the rush?
    After the curry I had last night I'm a bit slack this morning

  31. #18
    Senior Member Rank = Jussai RS2OOO's Avatar
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    Quote Originally Posted by Simon Fish View Post
    Water meters will have a maximum flow through them, it will depend on the meter.

    20 lt/minute would be a fairly decent flow rate.
    So yours is a bit slack.

    If its trickled in through a carbon filter what's the rush?
    The rush is;

    - Have to turn pump off while doing changes as water level goes below Nexus inlet. I don't like leaving Nexus off for many hours, although it probably does no harm.
    - Risk of forgetting to turn hose off
    - Actually getting enough hours at home in one go to be able to wait for it to fill up.

  32. #19
    If you fitted a ballcock or Torbeck valve you could just leave the hose running and walk away. That cures your last 2 problems.

    I think Andikoi fitted a Torbeck valve in his Nexus?

  33. #20
    Senior Member Rank = Jussai RS2OOO's Avatar
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    Quote Originally Posted by Frimley Koi keeper View Post
    If you fitted a ballcock or Torbeck valve you could just leave the hose running and walk away. That cures your last 2 problems.

    I think Andikoi fitted a Torbeck valve in his Nexus?
    That's in my future plans.

 

 
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