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This doesn't quite add up.
Scott, you say that the water has hardness of 8 to 10dh in the Netherlands. I am assuming that you mean a GH of 8 to 10dh?
Anyhow, if the GH is as high as you say, then the KH wouldn't normally be vastly different, I think it is probably safe to say that the KH is 6dh or higher? (mains water)
This being the case, then I would expect the TDS of the water to be perhaps 280 to 340 ish, which brings me to my next point...
Ivar, your TDS level of 80ppm on the mains and pond, would indicate a very good maintenance regime, or a very lightly stocked pond. If this mains water had a KH of perhaps 2.5 to 3dh, and GH of much the same, then this would be the kind of water that I would consider pretty much perfect (for me). 80ppm is low enough to get great results, but high enough to keep the Koi looking attractive along the way. Raising the TDS to perhaps 100ppm would make the Koi look prettier, but suffer slightly in terms of growth. Run at perhaps 60ppm, and the growth would be very slightly better, but colours would not be any good for Koi shows, or at least, not until the Koi got big, and older.
Given that you are in vaguely the same geological are as Scott, are you sure your TDS is that low??? Some of the TDS meters out there have a display that has to be multiplied by 10 to get the reading.
Mike.
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