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  1. #1
    Senior Member Rank = Grand Champion davethefish1's Avatar
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    Mains water kh warning!

    i've been working on setting up a DIY recycle RO for my pond,
    i hooked up my old RO set up from my reefkeeping days. and to test it still works had it working off the mains water for now.

    the TDS is 134 coming in (mains) and 1-2 going out (product water)
    so to see how much mains water i need to add to keep the KH level stable i tested my water today...

    it has always been high at a KH of around 8-9.
    tested today the KH is just 3!

    i've not tested regularly for that, as it has been the same for 22 years.
    and might be a reason for a spate of sudden KH crashes that have been reported to a local dealer.

    is there a pandemic shortage of sodium bicarbonate at the treatment plants?
    i've never had a mains water KH reading that low....ever....


    Last edited by davethefish1; 10-01-2022 at 12:28 PM.

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  3. #2
    Extreme Koi Member Rank = Supreme Champion john1's Avatar
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    Something you need to keep an eye on now Dave,I have kh of 0 to 1 from the tap so have to monitor it all the time but used to it now.
    John

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  5. #3
    Senior Member Rank = Grand Champion davethefish1's Avatar
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    Quote Originally Posted by john1 View Post
    Something you need to keep an eye on now Dave,I have kh of 0 to 1 from the tap so have to monitor it all the time but used to it now.
    just weird, i've been testing the water for years and wishing for lower KH...
    part of the reason i was setting up the recycle RO to lower the TDS.

    now i might have to get some sodium bicarbonate in....
    looks like you should be careful what you wish for lol!

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    Extreme Koi Member Rank = Yonsai sammy66's Avatar
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    Same down here in wiltshire , my KH was high last year about 9 the last 3 water tests that i done are at 5 and a PH of 8 .

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  9. #5
    Senior Member Rank = Mature Champion smartin's Avatar
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    Interesting Dave i will have a check, thanks for the warning....
    2200 gallons, infinity window, BD
    Evolve 4000 combi amalgam UV
    10k,20k AF pumps
    Skimmer trickle.

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  11. #6
    Moderator Rank = Supreme Champion Feline's Avatar
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    It can depend on where your source water is coming from- around here the water company will switch reservoir, or suddenly start pumping from rivers etc. etc. I live at the bottom of limestone hills (near Cheddar Gorge) so you would expect a high KH, but it’s actually very variable. At times of heavy rainfall there won’t be so many dissolved carbonates as the land is saturated so ‘pure rain’ will be collected instead of water percolated through the ground.

    Its definitely something to check now and again in your source water. I like having a Bluelab guardian giving me a constant reading for pond pH and TDS so I can see if anything in the pond is changing unexpectedly too.

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