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Thread: Hard water / reverse osmosis / standard water filters

  1. #1

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    Default Hard water / reverse osmosis / standard water filters

    I've installed a reverse osmosis unit but it's shite... it wastes @ 3:1 and takes forever to fill a tea cup never mind 20L.

    As a test I ran the water tester through some Brita style filtered water and the PPM went down from 400 to 200. Is this acceptable for Aero/Hydro until I can shell out/fit a bigger RO unit?

    I can remove any remaining chloride and chloramine using ecothrive but this didn't affect the PPM when I ran a test based on regular tap water. I thought it would have.

    Thanks

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    What ppm range is that? 200ppm sounds like soft water. Even 400ppm is not that high. EC measure would be easier :-)

    I am sure people are successful at these levels.

    Edit : Some RO units need a pump to get the best out of them. Mine use the external tap and makes 5L in 45 mins to 0.02 EC
    Current Grow (3L coco autos) : Jumper's 2020 shenanigans

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  5. #3

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    Quote Originally Posted by Jumper114 View Post
    What ppm range is that? 200ppm sounds like soft water. Even 400ppm is not that high. EC measure would be easier :-)

    I am sure people are successful at these levels.

    Edit : Some RO units need a pump to get the best out of them. Mine use the external tap and makes 5L in 45 mins to 0.02 EC
    I figured it might be water pressure but I haven't a pressure measure or pump at the moment... will get it sorted just takes a bit of time. I'd like to find a minimal waste RO unit but they cost a fair bit.

    The growboss nutradip shows

    ppm scale 0.5 = 100

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    ppm scale 0.7 = 134

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    ec = 200

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    What sort of water pressure do you have from the pump? How many gpd does the RO unit do?

    Is the ec 200 = 0.2 ?

    Ta

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    I think I just divide the EC number by 1000 so 200 would be 0.2.

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    No idea what my pressure is - not great, but gravity fed.

    I am not on a meter, so no idea of the waste. I would imagine more than you! Always seems to be on!!

    It is a 75 gpd unit. It screws on to the back garden tap. It has a 10m hard pipe feed - with no pump.

    I come from a reef keeping background so have loads of additional polishing pods etc. These all simply fit inline.

    However, at the moment the new unit is sweet. I use it standalone - simple 3 stage.

    The reality is RO units are extremely wasteful. I would not use one if I was on a meter. If they are not running at the recommended pressure for the membrane, they will perform badly.

    Happy to pm you the unit I have.

    Others use a 5 stage unit - these require more pressure still.

    YMMV

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    Quote Originally Posted by existence View Post
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    I think I just divide the EC number by 1000 so 200 would be 0.2.

    Normally by 1000 - just depends on your probe measurement scale.

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    Quote Originally Posted by Jumper114 View Post
    Normally by 1000 - just depends on your probe measurement scale.
    Yep the scale looks good. I'm suprised EC is 0.4 before filter and 0.2 after filter. I realise that having a low EC doesn't really give insight in to what nutrients build up that EC but a low EC is better than super high, for now. Obviously keen to tweak it but on the initial prop test I doubt the RO will be in place.

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